Fixed warnings in Bullet/src core library

Thanks Martijn Reuvers from Two Tribes B.V. (www.twotribes.com) for the patch

To make this work more visible, suppress warnings in external libraries in Extras (COLLADA_DOM, libxml and glui contain many warnings)
Added PreprocessorDefinitions: _CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE to vcproj files

Extras/ConvexDecomposition/raytri.cpp

@@ -1,3 +1,4 @@
+#include "float_math.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>