Add option to use alternate quickfix UI (e.g, Trouble)

[arthaud]

First of all, thanks for the plugin!

I would love if we could configure vim-dispatch to open Trouble instead of the builtin quickfix window (:copen).
I imagine there could be an option to define the command to open/close the quickfix window, and default to :copen/:cclose.

I know that there are workarounds, but they feel suboptiomal:

• Use nvim_create_autocmd on QuickFixCmdPost to call :cclose + Trouble qflist: This prevents you from using the builtin quickfix for other use cases
• Override Make to call silent make then Trouble qflist: that makes vim-dispatch synchronous, losing one of the benefit of the plugin.

Thanks!