PROTOCOL_VERSION, test items, MOTD fix (#18)

* 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.

src/main.cpp

@@ -28,6 +28,7 @@ int main() {
     }
 #endif
     settings::init();
+    std::cout << "[INFO] Protocol version: " << PROTOCOL_VERSION << std::endl;
     std::cout << "[INFO] Intializing Packet Managers..." << std::endl;
     PlayerManager::init();
     ChatManager::init();
@@ -50,4 +51,4 @@ int main() {
     WSACleanup();
 #endif
     return 0;
-}
+}