Begin breaking up the API file

src/API/Mouse.ts

@@ -0,0 +1,33 @@
+// mouse.ts
+export const onmousemove = (app: any) => (e: MouseEvent): void => {
+    app._mouseX = e.pageX;
+    app._mouseY = e.pageY;
+};
+
+export const mouseX = (app: any) => (): number => {
+    /**
+     * @returns The current x position of the mouse
+     */
+    return app._mouseX;
+};
+
+export const mouseY = (app: any) => (): number => {
+    /**
+     * @returns The current y position of the mouse
+     */
+    return app._mouseY;
+};
+
+export const noteX = (app: any) => (): number => {
+    /**
+     * @returns The current x position scaled to 0-127 using screen width
+     */
+    return Math.floor((app._mouseX / document.body.clientWidth) * 127);
+};
+
+export const noteY = (app: any) => (): number => {
+    /**
+     * @returns The current y position scaled to 0-127 using screen height
+     */
+    return Math.floor((app._mouseY / document.body.clientHeight) * 127);
+};