todotreeview: option to ignore all files not commited to git

[bf]

adding option to ignore all files which have not been added to the git repo

[bf]

This fixes an issue in lite-xl where PDF files which are in the project folder but not commited to the git repository would be scanned for the keywords. If a keyword like BUG was found the PDF binary data would be displayed in the UI, which is obviously not intended.

For me best heuristic was to discern between files which are commited to git and files which are not.

So now there is a setting where you can ignore all files which are not part of the git repository.