implemented UIEvents delegate in WindowContext

src/lib/ui/UIEvents.hx

@@ -13,4 +13,5 @@ typedef UIEvents = {
 	public var ?onMouseScroll:Callback<{dir:Int, pos:Pos}>;
 	public var ?onMouseUp:Callback<{button:ButtonType, pos:Pos}>;
 	public var ?onPaste:Callback<String>;
+	public var ?onChar:Callback<String>;
 }

src/lib/ui/rendere/UIEventDelegate.hx

@@ -0,0 +1,5 @@
+package lib.ui.rendere;
+
+interface UIEventDelegate {
+	public function getEventHandlers(): UIEvents;
+}