a little spring cleaning to remove some compiler warnings for

implicit declarations, redundant redeclarations, missing initializers,
nested externs and other cruft.

Cleaned up includes and moved extern _Type decls from Types.h into
Types.c since that is the only place where they are needed now.

Did not touch Ipo.[ch] since work is on-going there.

source/blender/python/api2_2x/Font.h

@@ -36,6 +36,8 @@
 #include <Python.h>
 #include "DNA_vfont_types.h"
 
+extern PyTypeObject Font_Type;
+
 typedef struct {
 	PyObject_HEAD		/* required py macro */
 	VFont * font;