Support denite as selector UI

[afk-mario]

Shougo new plugin replacing Unite is Denite, from the Readme:

Unite.vim is anything.el like interface for Vim. But the implementation is ugly and very slow. Denite.nvim resolves unite.vim problems. It is 10 times faster than unite.vim.

It would be nice to be able to choose it as the selector UI for Omnisharp

[tulsileathers]

Just bumping this. If one of the maintainers can lead me in the right direction, I'd be willing to look into putting together a PR for this.

[tulsileathers]

@nosami ?

[nosami]

Sorry, I haven't worked in C# or vim for a long time now.

@thinca is the maintainer

[tulsileathers]

Sorry just went off who had the most commits. Thanks for pinging the right person!

[thinca]

PR is welcome!
Feel free to contact me if you have any questions!

[nickspoons]

@tulsileathers I'm not a maintainer but I've been tinkering with OmniSharp-vim for a while. I've also just recently been updating some of the fzf/ctrlp/unite integration code to update the plugin to use 'v2' of the roslyn /codeactions functionality which is far superior (see #342).

As I said in that PR, I don't have any experience with unite or denite. If you do have experience with unite, perhaps a good place to start would be to take a look at the PR and see if you can get the existing unite functionality to use 'v2' instead of 'v1', as I've done for fzf and ctrlp?

Adding denite as a 4th option after that shouldn't be too complicated.

[nickspoons]

@tulsileathers are you still interested in having a look at this? Previous PRs are now merged, and I worked out the unite stuff so that's up-to-date too. If you want to have a go at adding denite now, that'd be great!