Changes

Releng: Tune eclipse-4.7.x-oxygen.target to pull minimal dependencies

- Remove eclipse.sdk.ide and emf.sdk in the Target Platform
- Add platform.ide , hamcrest and ecf for correct dependencies
- Enable "planner" mode in the Target Platform instead of "slicer"
  for automated resolving of dependencies.

Change-Id: I4a09e43501f312c59b8241838a59c3a413efe49e
Signed-off-by: Martin Oberhuber <mober.at+eclipse@gmail.com>

Releng: Further Simplify Target Platforms

- Source features are auto-discovered, no need to add
- By using the Planner, only root features are needed
- Use RSE runtime instead of SDK avoids doc.isv

Change-Id: I953b650e156742a5a7cbcc225e9dbdab3a3730ed

Bug 516330 - Releng: Restore Tycho-0.22 for Building with Java 7

- Make Mars the defaut target to build against to support Java 7
  along with cdt native serial for a full build
- Cleanup: Fix indentation
- Add Oxygen Profile

Change-Id: I21b1e9b0fb905c8c50889e9697f4d11231685945
Signed-off-by: Martin Oberhuber <mober.at+eclipse@gmail.com>