Finish enhancement for tab-traversal (issue #111)

Now pressing tab (shift+tab) in the properties table is possible to
navigate to the next entry downwards (upwards).
When cell editing is active tabbing (shift-tabbing) in the last (first)
cell will start over from the first (last) cell.

Change-Id: I43acf975a1de9a38d2165616adffb66acdf64c6f
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>
Fix small bug with traversal in properties viewer

Change-Id: Ib7cf9f088b930a8b99b0f4c75c37d5580502922c
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>
Implement "Link with Editor" feature (issue #112)

Change-Id: I177a8124bd7f6acf48057c6146f57aaa2b491c69
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>
Fix a bug with "Link with Editor"

If the navigator tree was not expanded to the specific element before
yet, it was not revealed correctly.

Change-Id: I86eeb551958a6fb2e3ce13834216cf4a810dc036
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>
Merge pull request #126 from DenisKnoepfle/master

Add Tab Traversal in Properties View and "Link with Editor" feature