Performance and plateaus as holes

Add Italian localization. Thanks @GregoryWarn!
Avoid using the tile hole cache until the workers finish processing to avoid errors when moving tokens immediately on scene load. May address #53.
Improve performance when measuring the movement penalty in terrains. Closes #58.
Use active effect origin to track which regions add terrains, to improve how terrains are added and removed when duplicate terrains are applied.
Handle region ramps or plateaus that move below the scene elevation (i.e., negative elevation values). Closes #57. As a result, you can now create "holes" in a scene using a plateau set to a value lower than the scene background.
Update libGeometry to v0.3.14 and refactor the cutaway methods.

What's Changed

• v0.4.4 by @Kharmans in #50
• Update module.json by @GregoryWarn in #56
• Create it.json by @GregoryWarn in #55

New Contributors

• @GregoryWarn made their first contribution in #56

Full Changelog: 0.4.5...0.4.6