Encodings are now honored for both sending and receiving. Cleaned up encode/decode

Encodings are now honored for both sending and receiving. Cleaned up encode/decode
stuff in the handlers and switched putCmd() et. al. to accepting (encoded) QByteArray only instead
of QString.
Also fixed notices being shown in a separate buffer upon reconnect, and the kick message problem (BR #99).
Oh, and the default kick reason defined in your identity is used if appropriate now.