Added: ErrorMessage response is sending when MessageCode is not
implemented
Added: DhcpConfig is now remebering dhcp config filename
Added: getter for filed _config_dir in class Config
Added: partial implemented support for message SEND_FILE in
Server::acceptConnection() (WARNING: FUNCTION IS NOT FINISHED YET)
Modified: finished SEND_FILE case in Server::acceptConnection
Added: SQL support in *.pro file
Fixed: Regular Expression for mac adrress
Refactor: Server::acceptConnection
Added: Saving dhcp.conf on message ACCEPT_IP
Added: Assigning all DhcpHosts to ComputerLabs before starting TcpServer
Refactor: HostContainer
Fixed: DhcpConfig is properly appending DhcpHost