Done:
* Fix the bug that the scripts of the selected object is not shown up on loading an XML file
* Fix the bug concerning ghost holder. The problem arose when one inserts a codelet into an empty conditional hold of a control codelet (e.g. if... then...). In that case, a ghost codelet holder was created, causing the problem.
* Implement read-only sensing properties (i.e. its value can't be modified by assignment statement). To specify a property to be a read-only property (instead of editable/assignable property), change the value assigned to RunTimeBehavior from "E" to "R" as shown below.
@AutomatableProperty(name="y", desc="y coordinate of current skateboarder position", DesignTimeBehavior="H", RunTimeBehavior="R")
public float m_y;
They are displayed as orange rectangles. Those read-only properties can be put in any rectangular holes, except the left hand side of any assignment statement.
* Add time sensing property for all objects. It is indeed from the engine's corresponding property in every simulation step.
TODO:
* parameters for event codelets
* messaging similar to Scratch
* pull-down menu to select sensing property, object name, etc
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