common: Use /quote by default for aliases

common: Use /quote by default for aliases

Sending `/quote` instead of `/msg` is probably the most widely used
method by other IRC clients and will also make them work out of the
box with DALnet that requires that commands to NickServ (as example)
to be sent explicitly as `/msg NickServ@services.dal.net` to work.

I've tested this myself in DALnet, Freenode and some other networks
with different IRCd flavours and all worked without any problems.