feat: add common vec2 and vec3 operations

include/curtle/vector.h

@@ -1,12 +1,23 @@
 #ifndef CURTLE_VECTOR_H
 #define CURTLE_VECTOR_H
 
-struct vec2
-{
-    double x;
-    double y;
+struct vec2 {
+	float x;
+	float y;
+};
+
+struct vec3 {
+	float x;
+	float y;
+	float z;
 };
 
 struct vec2 vec2_add(struct vec2 a, struct vec2 b);
 
+struct vec2 vec2_sub(struct vec2 a, struct vec2 b);
+
+float vec2_dot(struct vec2 a, struct vec2 b);
+
+float vec2_det(struct vec2 a, struct vec2 b);
+
 #endif