* split sys_math, sys_math3d, z_lib from global.h

* suggestions

* forgot this

* more math stuff

* nit fix

* re-add ichain.h

* resolve tharo's comments

* misc cleanup

* more fake matches

* revert for sym

* libc cleanup

* Suggested changes, small alloca tweak

* Remove printf include

* Doc units of trig functions

* "Very simple" yet I made a mistake

* sins returns in [-0x7FFF,0x7FFF] as the [-1,1] range

* Also `sys_math_atan.c`

* Remove `@param`s without descriptions

* Add note on Math_Atan2S/F arguments being unlike atan2

* "from (1,0) to (x,y)" -> "from vector ..."

* arg names -> `angle`

* Improve `@return` comment on atans

* Cleanup `UNK_TYPE`, `UNK_PTR` usage

* Add some missing empty lines after declarations

* Remove some legacy comments from non-matching times

* Fix some grammar (mostly "it's"/"its")

* Use proper names for two symbols after ZAPD bugfix

* Cleanup `place_title_cards.xml`

* Use `NULL` to check against `D_8012D260` pointer

* Parentheses around some macro arguments

* wip proofread headers up to z64animation.h

* Darkmeiro decompilation

Bg_Gnd_Darkmeiro decompiled, matched, and documented.

* give this a shot

* fix conflict

* one more try

* could be useful

* whoops

* ZAP2 stuff

* ZAP why

* ZAP again

* maths

* Factoriali -> Factorial

* soon, soon

* renames

* rand

* docs

* merged

* formatting

* little more cleanup

* asm crept back in

* changes to MathF

* smooth criminal

* functions.h

* cleanup libultra

* fixes

- use quotes instead of <> for includes
- add macros for zelda specific thread priorities
- fix Makefile
- properly format the remaining pfs structs

* fix button macros + add CHECK_BTN_ANY/CHECK_BTN_ALL

* remove ULTRA_ABS

* fix includes

* update z_player.c/z_lib.c + run format.sh

* merge upstream/master

* fix include in En_Goroiwa

* fix includes