* Cleaned up protocol selection.
* cmake now works even if protocol option is omitted
* make now supports protocol selection
* removed PACKET_VERSION/CNPROTO_VERSION* redundancy
* ubuntu appveyor script has yet to be written
* cleaned up some trailing spaces
* Add some test items.
Ironically, this change is untested.
* [bugfix] Transmit MOTD when entering the game, not when loading screen fades.
This fixes unnecessary retransmission when /warping.
