Fixed problems with UndoableEdits.
Added the possibility to define converters for parameters.
Fixed bug, conversion from degrees to radians was needed when creating a spotlight.
Fixed problem with undoable edits.
Added support for PropertyConverter.
Created interface that allows conversion of values for better support in user interface.
A quaternion converter converts a quaternion to euler angles and back.
Fixed package problem.
Undo and redo now post the appropriate level events to actually undo and redo the actions.
added toString method for easier debugging.
Removed setSelectionMaterial (no longer needed).
Float3ParameterUI now uses a PropertyConverter, if so defined.
Removed unnecessary imports and setSelectionMaterial.
Added debugging information for undo operations.
Added converter property for rotations.