This commit removes explicit source features and has tycho create them
automatically, along with all other source features that were not
previously defined. The logic to auto-generate is in the root pom.xml
For all pre-existing source feature, the name presented to the user has
been changed to use the default name used by Tycho, which is "Developer
Resources". This will provide a more standard user-experience with
respect to other source features built by Tycho.
Existing SDK features are kept for backwards compatibility.
All the names of the auto-generated source features that replace an
existing source feature have stayed the same except for the
'testsrunner' feature; for that one name change, a p2.inf file is added
to allow upgrading from the old named feature to the new named feature.
Change-Id: Ie632e798c93898fd828f88df4983fc43e2749d22
