- floatification of p_3dfloors, p_3dmidtex and p_acs.cpp plus some leftovers.

- removed all references to Doom specific headers from xs_Float.h and cmath.h.

src/math/fastsin.cpp

@@ -35,7 +35,11 @@
 
 #include <math.h>
 #include "cmath.h"
-#include "m_fixed.h"
+
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
 
 FFastTrig fasttrig;