Feature Request: Add Support to Launch in Zeal

[jalcine]

There's mention of launching support for Dash for OS X. Zeal works using the same docset system (for the most part). This is a request to add support Zeal.

[keith]

FWIW on the Zeal usage page, there is the config necessary to make it work with investigate: https://zealdocs.org/usage.html

I'd be totally open to supporting this more natively though.

[keith]

Also there's some related conversation here: #20

[jalcine]

Word. I can start peeking into this. It's become enough of a bump in my flow where I'd want to patch. #20 looks like a good foundation.

[jalcine]

Eh, it looks quite the same as this PR. Would need it to work for any language then.

[jalcine]

Spent some time hacking at this - looks like this might be more on Zeal's side. Granted, this has some Mac-specific stuff with that LSRegister jazz but I think this might be as simple as passing that handler to xdg-open (for best cross platform support across FreeDesktop-compliant desktops).

Was peeking at https://github.com/farcaller/DashDoc/pull/58/files.