Overwrites the auto-completion of other language servers

[tiansin]

Using some extensions will overwrite the auto-completion provided by the language server, hoping to improve as soon as possible.
Another suggestion is to be able to get advice from open documents, not just the current one.

I currently use extensions for similar features: https://github.com/atishay/vscode-allautocomplete
But I hope that your extension can surpass it, thank you.