v4.1.1

• Added compile-time 'features':
  • Ability to enable/disable some librg compile-time features
  • Entity igore tables are now optional, and can be disabled
  • Implmented simple optional Virtual world feature for entities
  • Implemented a feature to enable/disable octree culler (falls back to linear check)
  • Multiple features can be combined
• Added 'generation' to entity control lists:
  Setting, removing and setting control to the same entity again with same owner
  will now distinct between old and new controllers, and messages still coming
  from old control generation will be rejected in favor of new ones.
• Added guard to minimum sized packet in receive for both sides
• Added spherical culler handler, and ability to do runtime switch (LIBRG_USE_RADIUS_CULLING)
• Streamed entities are now going to be always returned in query for controlling peer
• Fixed issue with host setting on the server side
• Fixed nullptr crash on empty host string for client on connect
• Removed experimental multithreading code