GH221 - Refactor: removed extension points for descriptors and
extensions; temporary modifications to sync logic
GH221 - Remove harcoded reference to flex projects
GH221 - Merge remote-tracking branch
'origin/GH221-codesync-descriptors-operations3'

Conflicts:
	org.flowerplatform.editor.model/flex_src/org/flowerplatform/editor/model/DiagramEditorFrontend.as
GH221 - Added after they were deleted at merge