Adding support for the new VSCode extension

[Stefterv]

I am working on a new VSCode extension here: https://github.com/Stefterv/processing4-vscode-extension

This pull request will add the following:

• A new revision of storing the install location in Java Preferences
• A new command line path processing contributions examples list to list all the examples installed in Processing
• A new command line path processing sketchbook list to list all the sketches saved in the users sketchbook

For those who are curious and might want to contribute to the new extension feel free to try it from here: https://github.com/Stefterv/processing4-vscode-extension/releases/tag/latest

Fixes#1062

• Extend results returned by ExamplesList command

[Stefterv]

Are previews for the examples desired?

[SableRaf]

Are previews for the examples desired?

It looks pretty cool! Maybe that can be a toggle in the settings?

[Stefterv]

@SableRaf I added some TODO's in the README.md would you be up for filling those in?