Adds support for georeferenced coordinates.

[arjo129]

New feature implementation

Implemented feature

Adds support for visualizing OSM maps and using Geographic coordinates (Lat/Lon) instead of just (x, y) coordinates.

To use:
Go to tools->Georeference->Set Reference.... Enter latitude and longitude of reference. Press Set Reference. You should see the maps loading.
You may also set reference via anchor or move an anchor to a specified latitude/longitude using Move To Lat/Lon
You can adjust the map resolution using the bottom slider.
To view an offset you can use the Tools->Georeference->View Reference as UTM.

Known Issues

• We really should switch to Proj, but for now we use the utm crate because Proj's rust binding does not yet support WASM
• Map tiles should ideally be drawn in web mercator frame, however this would require us to warp the units of our building graph to support web mercator and then have those warped back to UTM.
• Changing resolution causes tiles to despawn and respawn. It would be better if the effect usses a fade in-fade out animation.
• Currently we use OSM's main service. Ideally we should be able to switch tile providers in the future.

[arjo129]

I've reworked the implementation significantly for this iteration and significantly simplified the user experience. It is probably ready for another round of review. The gaps between tiles have been eliminated. There are several ways to use this feature.

1. By loading an existing world.

You may download an existing world here and open it. You should be able to see the world in the screen like so (notice no more gaps):

You should also be able to toggle visibility from the "view" checklist. To enable this I added an API that allows us to extend menus via the ECS like what was done in #163

Screencast.from.2023-08-23.10-35-10.webm

You may also view the reference from the tools menu and change the tile reference via the settings. Note: There is a hard-coded tile limit setting the code (this is to prevent the cache size from exploding and us from hammering the OSM server). We should make this configurable in a future PR.
Screencast from 2023-08-23 10-38-32.webm

2. From a world without any existing reference.

We can use the example world. Open the Tool > Set reference panel. This should allow you to set an origin latitude and longitude.

You may also use the Inspect Anchor tool to move anchors to desired latitudes and longitudes.

We don't yet support using an anchor as a reference (that'll be a follow up PR) and we don't support lat/lon in the inspect Lane dialog (Also should be a follow up dialog).

As for the default world, I've not added its coordinates to this PR.

[mxgrey]

This new feature is very awesome! I've left feedback on some minor details, but fundamentally these changes are excellent.

[mxgrey]

I tweaked the syntax here to make it a bit nicer: b7b452e

Thanks for this feature, this is awesome!