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.

Demos/BspDemo/BspLoader.cpp

@@ -710,4 +710,5 @@ const BSPEntity * BspLoader::getEntityByValue( const char* name, const char* val
 		}
 	}
 	return entity;
-}
+}
+