Add --term-args command line argument

[sbogomolov]

Some terminal emulators (like foot) do not support an argument -e. With --term-args it is possible to customize the arguments passed to the terminal emulator. If this option is not provided -e is used by default to maintain backwards compatibility.

In case of foot we would use it like this:

--term="foot" --term-args=""

[electrickite]

This feature would be extremely helpful. Having more flexibility in how the terminal emulator is invoked would allow a wider range of terminals and help work around various WM issues.

[craigbarnes]

Some terminal emulators (like foot) do not support an argument -e

FWIW, foot now ignores the -e flag.