[398361] Enhanced Model Merge UI

- Add new Ruler next to StructureMergeViewer
- When select diff in StructureMergeViewer, highlight required and
unmergeable diffs,
and create annotations in Ruler
- Add new merge and navigation actions in StructureMergeViewer toolbar.
- Delete old merge and navigation actions in ContentMergeViewer toolbar.

Bug: 398361
Change-Id: I3d43fe9c4938404361f835e93631ed744a2c4377

61 files changed
tree: 82277280e364cdf5920ceed406b973605b3e3467
  1. org.eclipse.emf.compare-parent/
  2. packaging/
  3. plugins/
  4. .gitignore