mesa: include mtypes.h less

- remove mtypes.h from most header files
- add main/menums.h for often used definitions
- remove main/core.h

v2: fix radv build

Reviewed-by: Brian Paul <brianp@vmware.com>

src/mesa/state_tracker/st_cb_clear.c

@@ -33,6 +33,7 @@
   *   Michel Dänzer
   */
 
+#include "main/errors.h"
 #include "main/glheader.h"
 #include "main/accum.h"
 #include "main/formats.h"