Add Astron internal message types to MsgTypes.py.
Add Astron internal message types to MsgTypes.py.

Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d