Surveyor Map Framework

This update breaks the networking format!

Changes:

• Implement "friend tracking"
  • use SurveyorClient.getFriends() to get map-sharing-group-member locations - online or offline.
  • Uses player entity position when within render distance, and lower-resolution updates outside of it.
• Shared map area is now lost after leaving a group (depending on map mod, might take a restart)
  • Only explored area is cleared - client still keeps the actual map data.
• Shared map area now appears immediately after forming or expanding a group.

Changelog: https://github.com/sisby-folk/surveyor/releases/tag/v0.3.0