Restrict flying in Genesis to land owners and whitelisted accounts

This proposal would require guests on the Genesis server to travel around without the use of flying; and restrict flight to land owners and their whitelists. Optionally, a "flight license" NFT could be distributed for certain durations of time as needed.

This would encourage guests to more thoroughly explore the server and make them less likely to pass by many of the "hidden gem" smaller builds Genesis has to offer. This may also raise land owner rewards slightly for the owners of rail plots.

I believe that this proposal, if passed, would provide a more immersive and engaging experience on the Genesis server going forward.