Removed extraneous 'FCVAR_SERVER_CAN_EXECUTE' flag. We disconnect clients using 'CClient::Disconnect(..)', relying on the client is useless without an anti-cheat and anti-tamper. Client can still use this to disconnect on its own though.
'migrateme' seemed useless as well, removed 'FCVAR_SERVER_CAN_EXECUTE'.
This makes all 'FCVAR_SERVER_CAN_EXECUTE' require 'FCVAR_DEVELOPMENTONLY' to be stripped, in order to execute without the '-devsdk' parameter (development launch arg),