Write gen_defines.asm using a python script

Write gen_defines.asm using a python script

This allows cross compilation to enable unkonwn function handling as
gen_defines.asm will be generated without needing to run code meant for the
target platform. Previously, asm_offset.c wrote the gen_defines.asm file
by being run. Now, compilers emit their intermediate assembly output that the
parse_asm_values.py script knows how to find the relevant information from.

Additionally set the test framework `framework_config` build option to always
copy, instead of copy_if_different. This is needed since cmake wouldn't update
this file when changing from/to debug & release mode.