Bugfix in ViewsHistory
Updated Clipboard to use selection instead of asking views
EditorGameAssets sets components ignores

Clipbard also needs to serialize objects with editorGameAssets, so Save
can't set the ignores no more.
Updated Copy, Cut and Paste actions
Created ModelEntityCopyListener to copy/cut/paste model entities
Changes after refactor
"layer" operator added.
Format: (layer sLayerName)
Returns: the EngineEntity associated to the given layer
API changed = refactorings
Merge pull request #520 from anserran/viewshistorybug

Bugfix in ViewsHistory
Merge pull request #523 from anserran/copypaste

Updated Copy-Paste mechanism to use selection
Minor typo
TweenSystem listens to entity removal events so tweens of removed entities are killed.
This is important since entities are pooled
Test updated
Moving updater to editor-desktop
Added I18N strings.
Dummy Picture/Video desktop implementation.
Added Scenes UI widget.
Picture refactorings, added new UI panel.
Behaviours panel improvements.
UI widgets improvements and refactorings.