* Simplify MapOverlayToggleButton signature and let the instances use individually moddable images
* Gimp sources of new images (all from existing attributions)
* New images and atlas
* Show arrows on map for unit actions.
* Don't wrap arrows unless world wrap is actually enabled.
* Fix transported air units always being treated like teleports.
* Simple reviews.
* Separate movement arrow visibility checks from WorldScreen.
* Assets for map arrows overlay.
Co-authored-by: Yair Morgenstern <yairm210@hotmail.com>