audio_macros.asm: Add "Assertions"

[martendo]

Assembly will fail if set_envelope_duty, notelen, or note comes across an invalid argument.

[kemenaran]

Neat 👌

[kemenaran]

Although it makes the build fail with this message:

ERROR: src/main.asm(294) -> src/code/audio/music_1.asm(1760) -> src/data/music/music_tracks_data_1b_1.asm(120) -> src/code/audio_macros.asm::note(108) -> src/code/audio_macros.asm::note::REPT~1(110):
note: Invalid note value NOISE_5

[martendo]

The noise channel's values are different from the others and there isn't really a way to check for that unless there's a separate macro that performs a different "assertion." The best thing to do without that is to fail if \1 < $1 || (\1 > $90 && \1 < $ff).

[kemenaran]

Merged. Thanks!