Surveyor Map Framework

This update breaks the networking format!

Changes:

• Implement map sharing groups
  • Use /surveyor share [username] to request sharing with another online player.
  • Use /surveyor unshare to leave your current sharing group.
• Implement live map sharing - terrain, structures, and landmarks your friends encounter will appear on your maps.

Limitations:

• Changes to the group are not completely fluid - you'll need to rejoin the world to see pre-existing landmarks & terrain.
• Friend location tracking is not implemented yet - map area will appear from thin air.
• Friend-explored structures & terrain aren't wiped after leaving a group
  • We've architectured this to be possible, but it's not set up yet.

Changelog: https://github.com/sisby-folk/surveyor/releases/tag/v0.2.0