add command class
description function for pane
read errorfile path from pane object
don't make new pane current
helpers for getting tmux panes
helpers for adding command objects and executing them
create a main command object on load
execute the main command object by default via :Maque
use maque#util#warn
don't use the main command/pane when no aux pane is available
retab
simple tmux pane test
ctrlp menus for commands and panes