utils: added translation and box shape

utilities/translation.glsl

@@ -0,0 +1,8 @@
+mat2 rotate2d(float a) {
+    float c = cos(a);
+    return mat2(c, -sin(a), sin(a), c);
+}
+
+mat2 scale(vec2 s) {
+    return mat2(s.x, 0., 0., s.y);
+}