Added shortcut for creating objects: Object('param1', value1, ...)

Change-Id: Ic7caf501037fc3d0a3c3bac50af5f1478b809f45
LinkableVariable bug fixes for applying diffs & checking for diffs

Change-Id: I65beab016cfa769619893a3668c94c6d7001582b
LinkableBounds2D now extends LinkableVariable

Change-Id: Ie31bda3d150b992f5494c46b7a64a4d7d9d5ca07
small change to avoid function call overhead

Change-Id: I63d8cc53b9835ee71fe05530887dfaa78378502f
organize imports

Change-Id: I18e82064d57646d8e77f1d9dff012b48b9a267f5
added check to avoid unnecessary code

Change-Id: I3220f9f25fe2224223fb5aeb14c3a05284b18794
fixed display bug in layer visibility sliders

Change-Id: Ib06ad4a026dc818c9022e907616e1cf984223399