NSF driver update sequence

Documents the player update order (ft_music_play) of the NSF driver.

In order:

Run delayed channels
Check tempo accumulator to do a row update
- if counter <= 0:
  - ft_do_row_update
    - frame handling
    - ft_read_channels (foreach channels do:)
      - ft_read_pattern
        
        ft_read_note
        
        switch case pattern command
        
        handle volume commands
        
        handle instrument commands
        
        handle effect commands
        
        ft_push_echo_buffer
        
        handle note off
        
        handle note release
        
        load echo buffer
        
        ft_push_echo_buffer
        
        handle musical note
      - ft_read_is_done
  - ft_restore_speed
- else:
  - ft_skip_row_update (jumps to after row update code)
Decrement tempo accumulator counter
ft_loop_fx_state
- Sxx handling
- delayed transpose/release handling
ft_loop_channels (foreach channels do:)
- ft_run_effects (handles the rest of the other effects)
- ft_run_instrument
- ft_calc_period
- Nxy handling
ft_update_<chip> (foreach chip do:)
- (register writes)

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