Split Math.c into smaller files

Friend said that Math.c was too big and complicated.

src/Math/Line.c

@@ -0,0 +1,41 @@
+#include <BH/Math.h>
+#include <string.h>
+
+
+#define EPSILON 0.00001f
+#define PI      3.14159265358979323846f
+
+
+int BH_LineFromPoints(const float *a,
+                      const float *b,
+                      float *out)
+{
+    float tmp[2];
+
+    tmp[0] = a[1] - b[1];
+    tmp[1] = b[0] - a[0];
+    if (BH_Vec2fNormalEx(tmp, tmp) < EPSILON)
+        return BH_ERROR;
+
+    out[2] = BH_Vec2fDot(tmp, a);
+    memcpy(out, tmp, sizeof(tmp));
+    return BH_OK;
+}
+
+
+float BH_LineDistance(const float *line,
+                      const float *point)
+{
+    return BH_Vec2fDot(line, point) - line[2];
+}
+
+
+void BH_LineClosestPoint(const float *line,
+                         const float *point,
+                         float *out)
+{
+    float tmp[2];
+
+    BH_Vec2fScale(line, BH_LineDistance(line, point), tmp);
+    BH_Vec2fSub(point, tmp, out);
+}