some c_m3d (#97)

* decompiled some bgs_chk funcs

* c_m3d_g

* c_math progress

* remove duplicate SComponent headers

* move some variables and decompile a function

* some inlined from debug

* cM3d_2PlaneLinePosNearPos

* fix fabsf and decompile cM3d_CrawVec

* format

* cleanup

* more cleanup

Co-authored-by: Pheenoh <pheenoh@gmail.com>

include/mtx_vec.h

@@ -5,6 +5,12 @@
 
 struct Vec {
     float x, y, z;
+    float GetX() const { return x; }
+    float GetY() const { return y; }
+    float GetZ() const { return z; }
+    float getXDiff(const Vec* other) const { return x - other->x; }
+    float getYDiff(const Vec* other) const { return y - other->y; }
+    float getZDiff(const Vec* other) const { return z - other->z; }
 };
 
 struct Quaternion {