Fixed over 500 compile warnings. Mostly:

* Unused variables.
* Missing newlines at ends of #included files.
* signed int loop variables where the termination condition is an unsigned 'get number of' function.
* 'NULL' used inappropriately for an integer or character constant (NULL is a pointer)
* abstract base classes with no virtual destructor.
* Floating point constants used to initialise integer variables.

Extras/ConvexDecomposition/planetri.cpp

@@ -78,7 +78,6 @@ static void intersect(const float *p1,const float *p2,float *split,const float *
 {
 
   float dp1 = DistToPt(p1,plane);
-  float dp2 = DistToPt(p2,plane);
 
   float dir[3];