WIP: Pre fixing for version 1.6.3

[Ikuyadeu]

What problem did you solve?

Extends from #474

To publish a new version, we need to clean up the whole new source code.

How can I check this pull request?
I want to solve the following problems

• Fix eslint problems on rHelps.ts and rHelpTree.ts by defining the interface
• Apply for new cheerio API
• Apply for new vscode API

[ManuelHentschel]

I fixed the eslint warnings in the help related code and adapted it to the new cheerio/vscode APIs.
I left some of the eslint-disable statements in the code, in places where I don't see a better/safer way to achieve the same thing (e.g. when the entire line is wrapped in try-catch anyways).

The tests performed by GitHub actions seem to fail "randomly" sometimes and re-running solves the problem, no idea what's going on there...

[Ikuyadeu]

@ManuelHentschel Thank you for your help!
OK, I merge this and publish a new version.