Updates icons toback, tofront
Refactor of Reorder action
To follow convention of actions using other actions instead of
polimorphism.
Created ReoderSelection action, with test
Small refactor in scene editor
Updated UI to use new ReorderSelection action
Javadoc and other comments addressed
Fixed test
Icons updated
Added hud as entity category
Updated CoolDemo
Merge pull request #590 from anserran/hudnotsave

Added hud as entity category
Merge pull request #581 from anserran/orderbuttons

ReorderSelection action
Added/changed some strings and icons.
Added some checks in behavior edition.
Minor UI changes
Changed the widget for toBack and toFront, added in toolbar.
Merge pull request #594 from RotaruDan/SomeImprovements

Some improvements
Improved ImportEntity action to work with frames.
Renamed ImportEntity to ImportEntityResources action.
Renamed ImportEntityTest to ImportEntityResourcesTest.
Also fixed it after recent changes.
Improved RepositoryManager to work with Frames component and nested children.