all: Remove inclusion of internal py header files.

Header files that are considered internal to the py core and should not
normally be included directly are:
    py/nlr.h - internal nlr configuration and declarations
    py/bc0.h - contains bytecode macro definitions
    py/runtime0.h - contains basic runtime enums

Instead, the top-level header files to include are one of:
    py/obj.h - includes runtime0.h and defines everything to use the
        mp_obj_t type
    py/runtime.h - includes mpstate.h and hence nlr.h, obj.h, runtime0.h,
        and defines everything to use the general runtime support functions

Additional, specific headers (eg py/objlist.h) can be included if needed.

py/persistentcode.c

@@ -99,7 +99,6 @@ STATIC void extract_prelude(const byte **ip, const byte **ip2, bytecode_prelude_
 #if MICROPY_PERSISTENT_CODE_LOAD
 
 #include "py/parsenum.h"
-#include "py/bc0.h"
 
 STATIC int read_byte(mp_reader_t *reader) {
     return reader->readbyte(reader->data);