don't waste an extra system call for sending \r to the shell
allow nonblocking tmux command execution via vimproc
allow caching of output for tmux#pane#all()
make_pane() helper for command dispatching that caches list-panes output
optionally wait before autoclosing panes after command execution
set g:maque_loaded
generic make_pane() function
use make_pane() in command