General cleanup of the patch.

[TheLX5]

A few things about the patch are super messy and I think a general cleaning of said things would improve the overall experience when it comes to edit this patch.

Some planned changes:

• Come up with a better structure for powerup_defs.asm
• Create a few small changes to the hex edits area to let the user decide if the hijack should be reverted or not (it currently has issues with Smoke Sprites High Bytes patch)
• Make files in powerup_main_code, powerup_defs, powerup_img_code have proper names without needing to hardcode their names into the macro in powerup_defs.asm.
• Add more defines and proper descriptions to the files in powerup_defs folder.
• Perhaps an option to NOT include certain powerups (skip gfx and code)? I have no idea how painful will this be, but it'd be worth considering at some point. (NOTE: I don't mean rearranging the powerup list, it's not going to happen anytime soon)

This could be a good change for a potential v3.4.0 release since it would rearrange a bunch of things and most likely need to be ported to a new rom and deleting the old files.