SA-MP 0.3z R3

Huge changelog!!
Source files updated to SA-MP 0.3z R3 !!

- Fixes: Server crashes caused by network statistics functions
(GetPlayerNetworkStats, NetStats_*).
- Fixes: Invalid packet IDs sent by fake clients may cause a memory
leak.
- Adds: 'minconnectiontime (time in milliseconds)' server variable to
control the rate which the server accepts connections from newly
connecting players. Example: minconnectiontime 1000, the server will
accept a new connection every 1 second. If the server does not accept
the connection, the connection request will be ignored. It is not
recommended that you use this variable unless your server is under a
connection flood attack.
- Reverted all custom features back!