use new content assist classes when regenerating

Change-Id: Ieed1d745ace0f4463b029faa9c11356b7a3c33c9
added "ide project" option to the generator
use ide project paths in content assist fragments
maven build for xtext.ide
reverted a breaking change to the xcore maven test
ide project must be merged if ui project is merged
Merge "use new content assist classes when regenerating"
Merge "added "ide project" option to the generator"
Merge "use ide project paths in content assist fragments"
Merge "maven build for xtext.ide"
Merge "reverted a breaking change to the xcore maven test"
Merge "ide project must be merged if ui project is merged"