Added reverse-engineered interfaces lib code and hacked up tier1 and mathlib to build against the newer headers.

mathlib/quantize.cpp

@@ -21,6 +21,8 @@
 
 #include <math.h>
 
+#include "tier0/basetypes.h"
+
 static int current_ndims;
 static struct QuantizedValue *current_root;
 static int current_ssize;