decomp: board-h, board-util, gun-util, darkjak-h

[Hat-Kid]

• board-util seems good
• gun-util has a few problems:
  • I couldn't figure out draw-beam and (method 9 gun-info)
  • Some functions used static lists of pairs which was causing errors, fixed by removing a check in data_decompile.cpp (L225 as an example for such a list)
• joint.gc will fail the ref tests because root-channel in joint-control was changed to (inline-array joint-control-channel) from uint32 and this change was needed for a lot of stuff in gun-util and board-util as these deal with jetboard and gun animations a lot