Created by: semihalf-kardach-stanislaw
Convert instr_create_api.h and opcode_api.h to templates used by codec.py to generate final files.
As a result, add the codec.py to the build system and fixup opcode references which aren't valid anymore now that opcodes are named as in the Instruction Set Listing files.
Issue #3544
Signed-off-by: Stanislaw Kardach kda@semihalf.com