Introduce V2 type

oglt_math.h

@@ -1,6 +1,12 @@
 #ifndef OGLT_MATH_H_
 #define OGLT_MATH_H_
 
+#define V2_COUNT 2
+
+typedef struct {
+    float x, y;
+} V2;
+
 static inline float lerp(float a, float b, float t)
 {
     return a + (b - a) * t;