Launch vim and irssi on individual urxvt instances

By having vim and irris run on instances of the main urxvt daemon, if
and when they crash, the rest of the clients attached to the daemon will
go down with the ship. This is particularly problematic when one of
those other instances is compiling something.

Signed-off-by: Austin M. Matherne <AustinMatherne@Gmail.com>