Fix $global.$haxeUID being undefined in commonjs when compiling with Haxe 4

$global.$haxeUID |= 0 ensures that it's not undefined, but also won't change any numeric value > 0.

Perhaps an issue with hxgenjs?

Author: joshtynjala

src/motion/Actuate.hx

@@ -19,6 +19,13 @@ import flash.display.DisplayObject;
 
 
 class Actuate {
+
+	#if commonjs
+	@:noCompletion private static function __init__()
+	{
+		untyped #if haxe4 js.Syntax.code #else __js__ #end ("$global.$haxeUID |= 0;");
+	}
+	#end
 
 
 	public static var defaultActuator:Class<IGenericActuator> = SimpleActuator;