Match a lot of functions, add header for objects (#251)

* Match a lot of functions, add header for objects

* Refreshed a TON of functions and created/added to several
 header files

* Add header for code_800431B0, address comments

Signed-off-by: Taggerung <tyler.taggerung@gmail.com>

src/math_util_2.c

@@ -5,6 +5,7 @@
 #include "main.h"
 #include "variables.h"
 #include "math_util.h"
+#include "objects.h"
 
 #include "memory.h"
 
@@ -790,8 +791,6 @@ void func_80042760(Mat4 arg0, Vec3f arg1, Vec3f arg2, f32 arg3) {
     arg0[3][3] = 1.0f;
 }
 
-extern struct_80165C18_entry D_80165C18[];
-
 /**
  * @brief Tried to put the definitions in the declares. However, sp3C wants to be at the top.
  * Something may be possible with some padding. Couldn't find a way though. So we get big mess.