R11 - maybe final update

- Now possible to hide player from samp client (remove his name from
server query)
- Added OnRemoteRCONPacket, which will be called with every remtoe rcon
packet
- YSF callbacks will work same as original samp callbacks (after return
0, callback won't called in next filterscripts)
- Fixed protection against fake kill and fake pickup RPCs - this was
added before but doesn't work
- Added server.cfg option to set maximum live connections on the server
(maxconnections). This will maybe solution for server full attack, try
to increase it if your server was attacked before. But be careful! Big
amount will increase server memory usage. (thx Jachu to the idea, how to
fix this)
- Fixed IsPlayerSpawned