Further matches + bit of labelling (#228)

* match func_80058D5C

* minor cosmetic tweak

* what is to crush the spirit of somebody but to discover more unions

* dont mind me just switching computers

* remove a tempstruct

* temp thing

* match func_80054110

* Delete func_80054110.s

* racer.c cleanup

* Update math_util.h

* Update racer.c

* added CLAMP and WRAP macros

* Update math_util.h

* match func_80055A84

* he

* match func_80057A40

* we do a little labelling

* match update_camera_loop

* match update_camera_hovercraft

* Update structs.h

* pain.

* Update README.md

* Update racer.c

* like this?

include/math_util.h

@@ -4,8 +4,26 @@
 #include "types.h"
 #include "structs.h"
 
-extern s16 arctan2_f(f32 y, f32 x);
-extern f32 sine_s(s16 angle);
-extern f32 cosine_s(s16 angle);
+/**
+ * Keeps the value within the range.
+ */
+#define CLAMP(x, low, high) {          \
+    if ((x) > (high)) (x) = (high);            \
+    if ((x) < (low)) (x) = (low);              \
+}
+/**
+ * Allows an arbitrary range the number can wrap around.
+ * Often used for angles, to keep them within s16 bounds while stored in an s32.
+ */
+#define WRAP(x, low, high) {           \
+    if ((x) > (high)) (x) -= ((high) * 2) - 1; \
+    if ((x) < (low)) (x) += ((high) * 2) - 1;  \
+}
+
+s16 arctan2_f(f32 y, f32 x);
+f32 sine_s(s16 angle);
+f32 cosine_s(s16 angle);
+void func_80031130(s32, f32*, f32*, s32);
+s32 func_80031600(f32*, f32*, s32*, s8*, s32, s32*);
 
 #endif // MATH_UTIL_H