This is a PR I built for a friend of a friend at StrangeLoop, who is
making a much better LSP for elixir that elixir folks want to experiment
with. This PR also improves the our debug log viewer to handle LSP
restarts.
TODO:
- [ ] Make sure NextLS binary loading works.
Release Notes:
- Added support for the experimental Next LS for Elxir, to enable it add
the following field to your settings to enable:
```json
"elixir": {
"next": "on"
}
```