Add generic hook-scripts to TW to automatically update/delete/add remote tasks

Add a generic way to update remotes when working in taskwarrior/bugwarrior. Re-using authentication methods etc.

Suggested pilot: Use https://github.com/ralphbean/bugwarrior/issues/1011 and https://github.com/ralphbean/bugwarrior/issues/1012 as baseline implementation.

NOTE: This increases the usability of bugwarrior, but might be to taskwarrior-specific. However reusing the auth-mechanisms makes it sensible to make this part of bugwarrior.