meta issue: Create a language server powering all features to improve experience

[jens1o]

fyi: https://github.com/Microsoft/vscode/issues/47288

Although the current thing is, well, disgusting and would create a lot of maintenance cost and isn't flexible at all?

[jens1o]

Please create a separate issue for that and I'd be happy to discuss it there.

[nn-hh]

I erased it by mistake... Thank you #16

[jens1o]

see https://github.com/jens1o/vscode-smarty/commit/0d97b3c21badce5ba4abad538f8bdad2371587c7