Lsp: Option to disable autocomplete feature

[arsham]

• OS and language server
  Linux/gopls
• How you installed LSP
  git

I appreciate it if you would provide an option to disable the autocomplete functionality.

Thank you.

[tomv564]

Almost a duplicate of #574.

We could let the user blacklist some capabilities in an LSP setting and filter those out of our initialize request, saving us the effort of creating a new setting for every feature users want to disable.

[tomv564]

There is a new disabled_capabilities setting, adding "completion" to the array in your LSP settings should stop LSP from contributing to Sublime's autocompletion UI.

[arsham]

Amazing work, thank you.