Using HaxeUI in OpenFL neko/cpp target forces legacy implementation

[er453r]

I've added HaxeUI to my OpenFL project, and the html5 traget works fine.

The neko/cpp targets seem to force openfl into using legacy implementations of objects and I start to get tons of errors like:

Class<openfl._legacy.display.BitmapData> has no field fromBytes
openfl._legacy.display.Stage has no field window

[ianharrigan]

Yeah, unfortunately haxeui version 1 forces openfl legacy at the moment, its worth noting that version 2 doesnt have this limitation.