Moved some of _pixelEditorUtility.js functions to proper files

Also left some comments about where to put the leftover functions once we have a more detailed structure.

js/Input.js

@@ -1,4 +1,31 @@
 class Input {
+    /** Used to programmatically create an input event
+     * 
+     * @param {*} keyCode KeyCode of the key to press
+     * @param {*} ctrl Is ctrl pressed?
+     * @param {*} alt Is alt pressed?
+     * @param {*} shift Is shift pressed?
+     */
+    static simulateInput(keyCode, ctrl, alt, shift) {
+        // I just copy pasted this from stack overflow lol please have mercy
+        let keyboardEvent = document.createEvent("KeyboardEvent");
+        let initMethod = typeof keyboardEvent.initKeyboardEvent !== 'undefined' ? "initKeyboardEvent" : "initKeyEvent";
+
+        keyboardEvent[initMethod](
+        "keydown", // event type: keydown, keyup, keypress
+        true,      // bubbles
+        true,      // cancelable
+        window,    // view: should be window
+        ctrl,     // ctrlKey
+        alt,     // altKey
+        shift,     // shiftKey
+        false,     // metaKey
+        keyCode,        // keyCode: unsigned long - the virtual key code, else 0
+        keyCode       // charCode: unsigned long - the Unicode character associated with the depressed key, else 0
+        );
+        document.dispatchEvent(keyboardEvent);
+    }
+    
     static on(event, elementId, functionCallback, ...args) {
         //if element provided is string, get the actual element
         const element = Util.getElement(elementId);