ListEvent contains the list owner
Changes to adjust to the new API
Merge pull request #564 from anserran/ownerevents

Now ListEvent contains a reference to list owner
I18N strings.
Small fix after recent EditorGameAssets#resolve() changes.
Removed CombinedAction.
Small ImportEntity bugfix.
Now EditionContext is being setted before editing an element.
Size improvements to DescriptionCard widget.
Created LibraryScreen.
Changed RepositoryManager to work with libraries.
Improved hit detection in GroupEditor.
Added clipping in MockupSceneEditor.
Painted elements now keep scale and position when inported to the scene.
Increased painting accuracy.