[oden] Move scaling entirely into JavaScript

Now the game controls its own resolution. We might want to further
copy Love2D and generate resize events, I don't know.

src/graphics.ts

@@ -36,6 +36,16 @@ export function stroke(r: number, g: number, b: number, a: number = 1) {
   core.stroke(r, g, b, a);
 }
 
+/**
+ * Set the current scale factor.
+ *
+ * @param x - The scale factor in the x dimension.
+ * @param y - The scale factor in the y dimension. If omitted, defaults to x.
+ */
+export function scale(x: number, y?: number) {
+  core.scale(x, y ?? x);
+}
+
 /**
  * Print a message to the console.
  *
@@ -148,3 +158,10 @@ export function write_to_screen() {
 export function write_to_texture(texture: Texture) {
   core.write_to_texture(texture.id());
 }
+
+/**
+ * Get the dimensions of the screen.
+ */
+export function get_dimensions(): [number, number] {
+  return core.get_dimensions();
+}