Remove $Id$ tags, update URL's, and more

- remove obsolete svn '$Id$' tags from all source files
- update .fl files and generated files accordingly
- replace 'http://www.fltk.org' URL's with 'https://...'
- replace bug report URL 'str.php' with 'bugs.php'
- remove trailing whitespace
- fix other whitespace errors flagged by Git
- add and/or fix missing or wrong standard headers
- convert tabs to spaces in all source files

The only relevant code changes are in the fluid/ folder where
some .fl files and other source files were used to generate
the '$Id' headers and footers.

Author: Albrecht Schlosser

.clang-format

@@ -1,6 +1,4 @@
 #
-# "$Id$"
-#
 # clang-format control file for the FLTK project.
 #
 # Copyright 2017 by Bill Spitzak and others.
@@ -9,11 +7,11 @@
 # the file "COPYING" which should have been included with this file.  If this
 # file is missing or damaged, see the license at:
 #
-#     http://www.fltk.org/COPYING.php
+#     https://www.fltk.org/COPYING.php
 #
-# Please report all bugs and problems on the following page:
+# Please see the following page on how to report bugs and issues:
 #
-#     http://www.fltk.org/str.php
+#     https://www.fltk.org/bugs.php
 #
 #
 # Important notes:
@@ -46,11 +44,11 @@
 
 # FLTK settings (currently experimental).
 
-BasedOnStyle:					LLVM
+BasedOnStyle:                                   LLVM
 
 # The Language tag marks C++ options
 
-# Language:					Cpp
+# Language:                                     Cpp
 
 # The following options override the LLVM style definitions, if set.
 
@@ -65,61 +63,61 @@ BasedOnStyle:					LLVM
 # UseTab can be set to 'Never' (default) or 'ForIndentation' to avoid
 # this annoying bug of clang-format.
 #
-# UseTab:					Always
-UseTab:						ForIndentation
+# UseTab:                                       Always
+UseTab:                                         ForIndentation
 
 # Should we extend code lines beyond 80 columns ?
 # Default: 80
-ColumnLimit:					120
+ColumnLimit:                                    120
 
 # The FLTK CMP requires that case labels are indented (LLVM: false)
-IndentCaseLabels:				true
+IndentCaseLabels:                               true
 
 # There are sometimes more than 1 empty lines; should we keep 2 or more ?
 # LLVM default is 1.
 
-MaxEmptyLinesToKeep:				2
+MaxEmptyLinesToKeep:                            2
 
 # Present FLTK source code contains some short blocks and if statements
 # in one line, but we should better make it consistent and NOT use the
 # following "Allow..." statements (leave them commented out):
 #
 # LLVM default values:
-# AllowShortBlocksOnASingleLine:		false
-# AllowShortFunctionsOnASingleLine:		All
-# AllowShortIfStatementsOnASingleLine:		false
-# AllowShortLoopsOnASingleLine:			false
+# AllowShortBlocksOnASingleLine:                false
+# AllowShortFunctionsOnASingleLine:             All
+# AllowShortIfStatementsOnASingleLine:          false
+# AllowShortLoopsOnASingleLine:                 false
 #
 # FLTK values:
-# AllowShortBlocksOnASingleLine:		true
-# AllowShortIfStatementsOnASingleLine:		true
+# AllowShortBlocksOnASingleLine:                true
+# AllowShortIfStatementsOnASingleLine:          true
 
 # Short inline functions in header files are an exception to the above "rule":
 
-AllowShortFunctionsOnASingleLine:		Inline
+AllowShortFunctionsOnASingleLine:               Inline
 
 # The following is particularly useful for macros with continuation lines.
-# LLVM default:	AlignEscapedNewlinesLeft:	false
+# LLVM default: AlignEscapedNewlinesLeft:       false
 
-AlignEscapedNewlinesLeft:			true
+AlignEscapedNewlinesLeft:                       true
 
 # Include files should be left as-is until we know we can sort them
 # without any bad side effects (LLVM: true)
 
-SortIncludes:					false
+SortIncludes:                                   false
 
 # Multiple constructor initializers must be on consecutive lines:
 
-BreakConstructorInitializersBeforeComma:	true
+BreakConstructorInitializersBeforeComma:        true
 
 # Constructor initializers will be indented by 2 spaces (LLVM: 4):
 
-ConstructorInitializerIndentWidth:		2
+ConstructorInitializerIndentWidth:              2
 
 # Continuation lines (if automatically wrapped) may be indented differently.
 # This does not apply to function call arguments which are aligned to the
 # opening bracket. LLVM (default): 4
-# ContinuationIndentWidth:			2
+# ContinuationIndentWidth:                      2
 
 # Most of FLTK's code uses 'void *p' as opposed to 'void* p'.
 # This is particularly useful in combined declarations like:
@@ -131,9 +129,5 @@ ConstructorInitializerIndentWidth:		2
 # Note: this also applies to references like 'int &w, int &h', for instance
 # in function parameter lists.
 
-DerivePointerAlignment:				false
-PointerAlignment:				Right
-
-#
-# End of "$Id$".
-#
+DerivePointerAlignment:                         false
+PointerAlignment:                               Right

.gitattributes

@@ -14,50 +14,50 @@
 
 # files that will not be exported in source tarballs
 
-makesrcdist	export-ignore	eol=lf
-.gitattributes	export-ignore
-.gitignore	export-ignore
-.gitlab-ci.yml	export-ignore
-.travis.yml	export-ignore
+makesrcdist     export-ignore   eol=lf
+.gitattributes  export-ignore
+.gitignore      export-ignore
+.gitlab-ci.yml  export-ignore
+.travis.yml     export-ignore
 
 # fluid files (eol=lf or text?)
 
-*.fl		eol=lf
+*.fl            eol=lf
 
 # shell scripts etc. with Unix line endings (lf)
 
-*.ac		eol=lf
-*.in		eol=lf
-*.desktop	eol=lf
-*.sh		eol=lf
+*.ac            eol=lf
+*.in            eol=lf
+*.desktop       eol=lf
+*.sh            eol=lf
 
-fltk-config.in	eol=lf
+fltk-config.in  eol=lf
 
-documentation/make_pdf		eol=lf
-misc/config.guess		eol=lf
-misc/config.sub			eol=lf
-misc/update_config_scripts	eol=lf
+documentation/make_pdf          eol=lf
+misc/config.guess               eol=lf
+misc/config.sub                 eol=lf
+misc/update_config_scripts      eol=lf
 
 # files with Windows line endings (crlf)
 
-*.rc		eol=crlf
-*.bat		eol=crlf
+*.rc            eol=crlf
+*.bat           eol=crlf
 
 # Android Studio special support file (Windows .bat file)
 ide/AndroidStudio3/gradlew.rename_to_bat eol=crlf
 
 # binary files
 
-*.ico		binary
-*.icns		binary
-*.jar		binary
-*.png		binary
-*.jpg		binary
-*.ttf		binary
-*.xcf		binary
-*.xcf_gz	binary
+*.ico           binary
+*.icns          binary
+*.jar           binary
+*.png           binary
+*.jpg           binary
+*.ttf           binary
+*.xcf           binary
+*.xcf_gz        binary
 
 # image files that consist of ASCII text
 
-# *.xbm		text
-# *.xpm		text
+# *.xbm         text
+# *.xpm         text

.gitlab-ci.yml

@@ -31,12 +31,12 @@ stages:
 build-autotools:
   stage: build
   # install the necessary build tools
-  before_script: 
+  before_script:
     - apt update && apt -y install make autoconf man
     - apt -y install freeglut3-dev libfontconfig-dev libxft-dev
     - apt -y install libxcursor-dev libxinerama-dev libasound2-dev
     - apt -y install libpango1.0-dev libcairo2-dev
-  script: 
+  script:
     - make clean
     - ./configure --enable-pango --enable-cairo
     - time make -j3

CHANGES.txt

@@ -1,4 +1,4 @@
-Changes in FLTK 1.4.0					Released: ??? ?? 2020
+Changes in FLTK 1.4.0                            Released: ??? ?? 2020
 
   General Information about this Release