Tooling update: new version of the nimlangserver and the vscode extension

[nickysn]

@gcao, Ctrl-Shift-O works for me under Linux. I doesn't say "No editor 
symbols". Instead it shows a list of symbols. So, it's supposed to work. Please 
report an issue with detailed steps on how to reproduce: 
<https://github.com/nim-lang/langserver/issues/new> In the bug report, please 
provide as many details as possible, e.g. operating system, VS Code version, 
Nim version, the way you've installed Nim, the .nim source file you're trying 
this feature on, what other VS Code extensions you have installed, your VS Code 
configuration, etc.