dispatch.vim 1.2

* Make :Start idempotent, finding existing process if running.
* Provide :Spawn with :Start's old, non-idempotent behavior.
* Show PID of created process.
* Enable compiler plugins to provide custom completion.
* Allow :0Dispatch to bypass focus.
* Strip out ^[[K and progress bars in tmux output.
* Don't tmux pipe-pane if error format targets \r or \e.
* Use wmctrl if available to enable X11 :Start!.
* Use :cwindow semantics when opening/closing quickfix window.
* Remove catch-all ignores from error formats.
* Show shell command not Vim command in "Finished" message.
* Add QuickFixCmdPre cgetfile event.
* Add QuickFix dispatch-make events.
* Don't fire modelines for QuickFix events.
* Fix shell escaping of exported bash functions.
* Fix output of :Focus when focused on Vim command.