Implement trigger scene nodes and some scene event dispatching system.

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We need to get notified, when an object (e.g. player) enters or leaves an area, 
or performs certain actions. Now there is no way of doing this without an 
trigger node. This is fully creative task and on full responsibility of the 
solver ;)

Original issue reported on code.google.com by yinotaurus on 10 Dec 2010 at 2:34

• Blocked on: Integrate JBullet physics into scenegraph #3

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Original comment by yinotaurus on 10 Dec 2010 at 2:35

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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Original comment by yinotaurus on 10 Dec 2010 at 3:09

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Original comment by yinotaurus on 10 Dec 2010 at 8:44

• Added labels: scene

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For now a AABB trigger scene node is enough. Triggers could emit Events, which 
possibly can be emitted by jBullet physics simulation on collisions, touches, 
drifting between pairs of bodies, or based on body state (like: speed, 
position, orientation (gyroscope), ...)

Original comment by yinotaurus on 19 Feb 2011 at 3:29

• Changed state: Started