-Further xtend-transformations. Properties will be held as *.java-classes, as there is a problem with anonymous classes for listeners (e.g. ModifyListeners). Defining listeners in its own java-classes would be too much overhead. Thus, properties will stay as java-classes.

-Bug-Fixes in custom-features:
* Sub-Activities will now be placed correct in the xtend-version
* Merging now removes pictogram-elements not needed by canvas anymore

-Moved filter to their own package

-Merged several Util-Classes (e.g. naming-helper into NamingHelper.xtend)

TODO: Test!