CivVoxelMap

Updates to VoxelMap version 1.21.11-1.16.1

Your "Hide elevation" and "Hide sneaking" options will have been reset since these fairplay options have been adopted upstream.

Removes the "Hide invisible" option: VoxelMap's settings GUI was refactored in a way that makes it difficult, though not impossible, to mixin. Instead of making the attempt, I figure it'd be more worthwhile to try upstreaming the feature to VoxelMap given the recent additions of the other fairplay options.