Added some more keys to KeyControls.js

lib/controls/KeyControls.js

@@ -19,6 +19,21 @@ class KeyControls {
 		return this.keys[32];
 	}
 
+	get ctrl() {
+		// Control
+		return this.keys[17];
+	}
+
+	get shift() {
+		// Shift
+		return this.keys[16];
+	}
+
+	get escape() {
+		// Escape
+		return this.keys[27];
+	}
+
 	get x() {
 		// Arrow Left or A (WASD)
 		if (this.keys[37] || this.keys[65]) {