* feat: cloud mask, tile info box, perf improvements

Add sky-mask component that shows/hides multiple layers of clouds and fades them in/out based on zoom level. This allows a decreased viewport at lower zoom levels for better perf.
Skip render loops when there are no tiles + more DRY render code.
Add tile info box that shows a description of the selected tile. Descriptions are generated in getDescription on Actors.
Add UI render layer for selection icons, UI effects, etc.
Add selected tile icon and hook it up to selection.
Tile selection is still buggy (at higher zoom levels, the tile selection is offset :(

* feat: re-enable person entity

Add name generator for animals as well as people.
Add person back to game.
Move repeated lerp functions into misc-utility and standardize param order.