Merge branch 'feat/protobuf-protocol' into 'master'

Rewrite the protocol to use protobuf

See merge request starkingdoms.tk/starkingdoms.tk!1

translate server to protobuf protocol

resolve merge conflict

multiple players support

yay fancy planet code, but not tested :(

other players added, we'll see if it works

earth theoretically implemented

cargo-fix

added player (yay) does it work? idk, client broke

yay broken, player initialization

physics engine start

yay merged the file swap (why git why)

fine core, added position packet

merge conflict generator (clean up naming of handler/manager in server/)

rename to manager.rs

stop mainloop when it errors - fix pingpong

fix the client

Merge remote-tracking branch 'origin/master'

# Conflicts:
#	Cargo.lock
#	client/src/lib.rs
#	server/src/client_handler.rs
#	server/src/handler.rs
#	server/src/main.rs

SLP

cleanup