palette is now a UIList
nodes can be collapsed/expanded using right mouse click
copy subtrees using SHIFT
link subtrees using SHIFT, does not work fully
Merge remote-tracking branch 'upstream/develop' into behavior
updated to latest changes
Tasks are now injected
Merge remote-tracking branch 'upstream/develop' into behavior

Conflicts:
	engine/src/main/java/org/terasology/logic/players/MenuControlSystem.java
Fixed an issue causing block ids to be restricted to byte values instead of shorts.
Fix for calculation of widget sizes when dealing with regions of MAX_INTEGER.
Added permissions to AnnotationParser to allow access to annotations.
fixed bt editor layout
editor now opens using F5
Added annotation to mark valid WorldGeneratorPlugin classes for registration.
Removed support for annotations in modules (wasn't possibly to properly support within sandbox restrictions)
Added permission for WorldGeneratorPluginLibrary.
refactored Task and Interpreter
Stopping a task now stops all tasks, that were started by the task.
Merge remote-tracking branch 'upstream/develop' into behavior

Conflicts:
	engine/src/main/java/org/terasology/logic/behavior/nui/BehaviorTreeEditorSystem.java
Remove lwjgl dependencies from Texture
added some icons
Merge pull request #859 from synopia/behavior

added some icons
Merge pull request #856 from mkienenb/remove-lwjgl-deps-texture

Remove lwjgl dependencies from Texture
Implemented NUI based loading screen.