TilesRenderer: Consider forcefully evicting tiles until cache is not overfull #1232
Description
Eg if the cache size is changed, or new, higher priority tiles are loaded. Related to #1230.
If tiles are downloaded with a different priority than they are evicted than it's possible that there will be a flicker or "downgrade" when evicting tiles. We also don't want to download tiles if they can't be fit in the cache or will be immediately evicted - so how can we know? This is only an issue when the cache is so full it can't fit tiles that should be visible.