[Patch] Add layer invalidation listener

[michael2402]

This patch allows you to register a listener on every layer that gets notified whenever that layer needs to be repainted.

This is intended to replace those MapView#repaint() calls. After changing to this system, we might use more efficient caching of the individual layers to allow e.g. the background to be re-rendered without requiring to render the osm data layers again.

It makes code cleaner as well and removes a dependency on the MapView.

I only replaced a hand full of repaint() calls, we might replace more of them in the future.

[Don-vip]

In 10031/josm:

fix #12654 - Add layer invalidation listener (patch by michael2402)

[Don-vip]

Milestone renamed