Improve visual appeal of diagrams by adjusting colours and line
thickness.
Start using List instead of ArrayList to be more generic.
- Add a sub menu on the PackageDiagramEditor context menu to support
"New Action", "New Filter" and "New Merge Group".
- Implement the ability to select UIFileGroups, then create a merge
group from the context menu.
- Partial implementation of "New Filter" command.
Add getSlotByName() convenience method to IActionMgr.
Add support for automatically connecting a UIFileGroup into a
newly-created Action's "Input" slot.
Rename getSelectedBusinessObjects() to getBusinessObjectFromElement()
since it's a more relevant name (it has nothing to do with selected
objects).
Refactor some methods to use GraphitiUtils.getSelection().
Fix bug that caused a crash when deleting a file group that had a
neighbouring file group.