Header file clean up and warning fixes

- Mostly this cleans up the #includes and header files in the python project.
- Warning fixes are mostly casting issues and misc fixes. General warning clean up.
- #include Python.h MUST come as the first include to avoid the POSIX redefine warning in the unix makefiles
- fno-strict-aliasing flag added to makefile to fix a unavoidable type punning warning in types.c

source/blender/python/api2_2x/quat.h

@@ -34,6 +34,8 @@
 #ifndef EXPP_quat_h
 #define EXPP_quat_h
 
+#include <Python.h>
+
 #define QuaternionObject_Check(v) ((v)->ob_type == &quaternion_Type)
 
 typedef struct {