Begin slimming down PointLike.

src/core.rs

@@ -333,6 +333,16 @@ impl PointLike for Vec2 {
     }
 }
 
+impl PointLike for IVec2 {
+    fn x(&self) -> f32 {
+        self.x as f32
+    }
+
+    fn y(&self) -> f32 {
+        self.y as f32
+    }
+}
+
 impl PointLike for (i32, i32) {
     fn x(&self) -> f32 {
         self.0 as f32