Collider and Mover code

[Gervase Lam]

Attached is some new source code and cvs diffs for Colliders and Movers.  
The NEW files should go into the Games/Pingu/src directory.  Not too sure 
if it is the correct place to put all of the new files.  Also, could this 
be carefully code reviewed before being committed?

I've tried to do things like use forward declarations for classes instead 
of using include files.  However, I only found it worked in mover.hxx.

I've also moved pingu_height and deadly_velocity into pingu_enums.hxx as I 
was beginning to worry that these constants would be defined multiple 
times in the source code.  Initially I thought of putting them into 
globals.hxx.  However, I think pingu_enums.hxx is better because it 
applies only to Pingus.  This is despite the fact that the filename says 
enums.

For the time being, a Linear Mover and a Collider have only been used on 
Bombers (i.e. immediately after the countdown has reached zero).  This 
will allow other people to test it before it is applied to the Fallers, 
which are much more common.

Thanks,
Gervase.

pingus.200301122236.cvs.diff
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mover.hxx
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pingu_collider.hxx
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linear_mover.hxx
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pingu_collider.cxx
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upright_pingu_collider.hxx
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upright_pingu_collider.cxx
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