Refactor, separate docs from headers, add ru docs

Doxygen kind'a sucks and I need multilanguage documentation, so I did
that. Also, separated massive Math.h file into smaller files.

include/BH/Math/Vec4f.h

@@ -0,0 +1,80 @@
+#ifndef BH_MATH_VEC4F_H
+#define BH_MATH_VEC4F_H
+
+#include "../Common.h"
+
+
+void BH_Vec4fAdd(const float a[4],
+                 const float b[4],
+                 float out[4]);
+
+
+void BH_Vec4fSub(const float a[4],
+                 const float b[4],
+                 float out[4]);
+
+
+void BH_Vec4fMul(const float a[4],
+                 const float b[4],
+                 float out[4]);
+
+
+void BH_Vec4fScale(const float a[4],
+                   float b,
+                   float out[4]);
+
+
+void BH_Vec4fMulAdd(const float a[4],
+                    const float b[4],
+                    const float c[4],
+                    float out[4]);
+
+
+void BH_Vec4fNegate(const float in[4],
+                    float out[4]);
+
+
+float BH_Vec4fDot(const float a[4],
+                  const float b[4]);
+
+
+float BH_Vec4fLength(const float in[4]);
+
+
+void BH_Vec4fNormal(const float in[4],
+                    float out[4]);
+
+
+float BH_Vec4fNormalEx(const float in[4],
+                       float out[4]);
+
+
+void BH_Vec4fMin(const float a[4],
+                 const float b[4],
+                 float out[4]);
+
+
+void BH_Vec4fMax(const float a[4],
+                 const float b[4],
+                 float out[4]);
+
+
+void BH_Vec4fLerp(const float a[4],
+                  const float b[4],
+                  float t,
+                  float out[4]);
+
+
+void BH_Vec4fProject(const float a[4],
+                     const float b[4],
+                     float out[4]);
+
+
+void BH_Vec4fBarycentric(const float a[4],
+                         const float b[4],
+                         const float c[4],
+                         float v,
+                         float w,
+                         float out[4]);
+
+#endif /* BH_MATH_VEC4F */