Document catching_show (unk_020562F8)

[iriv24]

unk_020562F8 -> catching_show
Deleted include/struct_decls/struct_020564B4_decl.h and moved its struct into include/catching_show.h

If you are wondering what a Catching Show even is, this should help.
I like to think of it as Safari Zone -> Pal Park, Safari Game -> Catching Show.

Notes/things I am unsure about:

• Is include/unk_0204C500.h the correct place to add the CATCHING_SHOW_POINTS_CATEGORY enum? And can I reference that enum in res/field/scripts/scripts_pal_park_lobby.s? I couldn't figure out how to make that happen, though it feels like it should be an easy thing to do. -- taken care of, thank you @cbt6
• Most of the things I didn't document in catching_show.c revolved around NARC_ReadFromMemberByIndexPair. I haven't done any NARC unpacking yet (RavePossum did give me some good explanations for those though, thanks Rave :D), and I would like to do the follow up PR to this one to unpack it and finish documenting this file.
• Other things I didn't document I believe were some RNG functions and things related to SaveData_PalParkTransfer, which I was also a bit unsure about

If this gets approved, can remove "unk_020562F8 - Pal Park library" from #325

[cbt6]

Move the enum in include/unk_0204C500.h to consts/ (see the files there for example). That way you can use them in field scripts.

[lhearachel]

This looks great! I have only a few thoughts listed below; these are non-blocking, but I would like to incorporate the special identifier for cartridge version 0 into this PR, if possible.