Merge pull request #2217 from ales-erjavec/osx-app-reboot

[ENH] Reimplement macOS application (.app) build scripts

Author: astaric

scripts/build-osx-app-template.sh

@@ -0,0 +1,14 @@
+Orange macOS application (.app) build scripts
+---------------------------------------------
+
+Contents:
+
+python-framework.sh
+    Download, unpack and make relocatable the official python.org framework
+    installers (used by build-macos-app.sh)
+
+build-macos-app.sh
+    Build an Orange.app application bundle from scratch
+
+create-dmg-installer.sh
+    Pack the Orange.app applicaiton into a .dmg installer disk image