Favorites and database fixes, players info and extended server config.

Adding a favorite server now requires created valid profile. It will
not allow to create favorite server without proper profile.

Fixed servers updating database, now they put all fields there.

Added stubs for players info and extended server config things in
database.

datamodels/server.go

@@ -34,4 +34,8 @@ type Server struct {
     Password            string          `db:"password"`
     // Profile to use with server.
     ProfileToUse        string          `db:"profile_to_use"`
+    // Extended server's configuration.
+    ExtendedConfig      string          `db:"extended_config"`
+    // Players information.
+    PlayersInfo         string          `db:"players_info"`
 }