[e4] Create corresponding features for RAP e4

Remove the migrated RAP Incubator features
org.eclipse.rap.e4.base.feature and
org.eclipse.rap.e4.target.feature from the build and from the Git
repository.

Replace them with new ones that match the existing RAP naming
conventions:

- org.eclipse.rap.e4.feature:
  All RAP e4 specific bundles from the RAP project.
- org.eclipse.rap.e4.sdk.feature:
  Source bundles for above bundles.
- org.eclipse.rap.e4.equinox.target.feature:
  All 3rd party bundles that are required to build and to run a basic
  RAP e4 based application.
- org.eclipse.rap.e4.examples.feature:
  RAP e4 example project(s)

Change-Id: I7cc4b48372ae24d6cfb68e6dea6c3b294894118f
Signed-off-by: Markus Knauer <[email protected]>

Author: mknauer

README.md

@@ -37,6 +37,10 @@ features in
 
     releng/org.eclipse.rap.build/repository/target/repository/
 
+and a second one with the RAP e4 Runtime bundles in
+
+    releng/org.eclipse.rap.build/repository.e4/target/repository/
+
 Official builds are available from the [RAP Download page] [4].
 
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