Decompile z_play.c and Match/Document some of z_view.c

[Roman971]

Main Changes:

• Decompiled z_play.c (including data/rodata/bss) with 7 non matchings left. I documented what I could but didn't spend too much time looking into other systems not well known yet, so a lot will still have to be documented at a later point. In particular, a lot of functions in this file deal with transition (fbdemo) and camera stuff, which have barely been touched so far.
• Matched 4/5 of the remaining functions in z_view.c. I also changed some names and documented where I could while working on this file. But someone familiar with viewing/projection stuff (for example from OpenGL) would probably be able to document more of it.

Other smaller changes:

• Matched the last function in z_sample.c.
• Updated some game state function names to better fit certain patterns.
• Fixed the SaveContext struct and sub struct members to use camelCase instead of snake_case.
• Changed certain color structs to be unions so a whole word can be used to access the rgba color.
• Added a QuestItem enum and CHECK_QUEST_ITEM macro to access and check quest items.
• Fixed various minor issues throughout the codebase when I ran into them, as usual.

[krimtonz]

Mostly just some suggestions rather than fixes.