add support for --class, --title and -e

title. it would be handy to have them like every other terminal. -c and -t can be used to set a terminal class and name to facilitate finding, like making scratchpad sessions and make just them transparent with picom. -e is self explanatory, to have something executes as soon as termonad start.

Start by locating the command-line argument handling for termonad; the issue names support for --class, --title, -c, -t, and -e. Confirm the expected terminal class and title behavior and how a command should be launched, then verify that each option works when starting termonad.

Written by the indexing model from the issue text.