[v2] Add snippets

[mark-wiemer]

Is your feature request related to a problem? Please describe.
AHK v2 scripts don't have the same snippets and hover text as v1 scripts. Please add this so I can have more context on the code I write.

Describe the solution you'd like
Same as v1: Auto-suggest and info on hover.

Describe alternatives you've considered
I have to use an alternative extension for this.

[mark-wiemer]

Leaving out of initial preview release as this isn't critical. Should be pretty easy to add though!

[mark-wiemer]

Formatting and snippets are both underway, I'm working on cleaning up thqby's code.

Then I'll add tests and work to integrate it with the existing project :)

Ref https://github.com/mark-wiemer-org/vscode-autohotkey2-lsp

[mark-wiemer]

It only took 366 days to get this into pre-release :D