EnMag OK and documented (#547)

* Name textures in object_mag

* Corrections

* tabs -> spaces

* OK, data imported

* Remove obsolete comment

* Start documentation

* Defines for most texture sizes

* Name most static variables, add state enum

* Macros, name all the statics

* Couple of minor tweaks to other files

* Name some more effect stuff

* Fix kanfont data

* Name everything else, move macros

* Format

* Review

src/code/sys_math.c

@@ -34,7 +34,7 @@ f32 func_80179400(s32 n) {
 
     //! @bug No check for negative argument. Will read the array out-of-bounds if the argument is negative.
     //! (The OoT version does an unsigned check instead, which will return sFactorialTbl[12] for a negative argument.)
-    if (n > 12) {
+    if (n >= ARRAY_COUNT(sFactorialTbl)) {
         ret = sFactorialTbl[12];
         for (i = 13; i <= n; i++) {
             ret *= i;