Diagnostics

[wkillerud]

This feature enables publishing Diagnostics from the language server to the client.

The scope for diagnostics in the Sass language server will mainly be focused on the Sass language itself (deprecations, for example).

Some Sass includes lint diagnostics for CSS (originally from Visual Studio Code's built-in language extension). We will not include these lint rules here, at least to begin with. We may adopt some lint rules over time, but specialized linters like Stylelint are probably better suited for this.

• Implementation
• Tests
• Usage in the server