Chapel: Support Vundle for vim-chapel plugin

[ben-albrecht]

Vundle, the popular vim plugin manager, only supports installing vim plugins from a git repository, e.g. vim-fugitive.

To support this, we could host a repository containing the contents of chapel/highlight/vim/ so that users could install Chapel vim support with the following in their ~/.vimrc:

Plugin 'chapel-lang/vim-chapel'

One obvious downside of this is the maintenance issue, as we'd need to propagate updates from chapel-lang/chapel to chapel-lang/vim-chapel on a per-release granularity.

[ben-albrecht]

The lack of Vundle support was brought up in #6785

[psahabu]

@ben-albrecht should we knock this out?

[psahabu]

@dmk42 making sure you can see this issue, I'm planning to knock it out soon unless there are objections

[dmk42]

No objections here, thanks.

[psahabu]

The team has decided that this project would be best handled by a member of the community using a repository outside the chapel-lang namespace.

When such a repository is created and usable by Vundle, directions for installation should be included in the main repo.

• [ ] create a new repository for Vundle users to enable Chapel highlighting
• [ ] update highlight/vim/README.rst with Vundle instructions

[ben-albrecht]

We could actually support Vundle by adding .git information to highlight/vim/ so that it is able to git clone $CHPL_HOME/highlight/vim.

We wouldn't want to check this .git directory into our repository as a git submodule, so we'd keep it packed up, and instruct users to unpack it if they want to use Vundle.

I double checked that this works here, but am not sure if it's a direction we want to take. I haven't heard any requests for Vundle support since @buddha314 asked (which inspired me to open this issue), and he has since found the light and moved on to vim-plug 👍

[psahabu]

If Vundle is getting supplanted by vim-plug, I would support closing this issue just to tidy up. If some future person is really motivated to do Vundle for Chapel, they'll find this issue and do it themselves.

[ben-albrecht]

I think we can leave this open for interested contributors to find, with the task being "Create and maintain a git repository for Chapel.vim as a Vundle plugin."