m3d (#13)

* Initial M3d Pass
* `m_bmdl` and `m_bline` left

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Co-authored-by: elijah-thomas774 <elijahthomas774@gmail.com>
Co-authored-by: Elijah Thomas <42302100+elijah-thomas774@users.noreply.github.com>

include/egg/math/eggVector.h

@@ -127,6 +127,7 @@ struct Vector3s {
     s16 x, y, z;
 
 public:
+    Vector3s() {}
     Vector3s(s16 sx, s16 sy, s16 sz) {
         x = sx;
         y = sy;