initial commit of skeleton files
fixed overlay operation in case it's ever useful; removed unnecessary code
added preference watcher for untrusted and temp-trusted, still needs lots of work
Converted to bootstrapped extension; replaced alerts with console logging; added unloading of SABER preferences monitor on shutdown
changed to use 'this' instead of fully-qualified name (scoping was wrong); fixed handling of NoScript lists being empty
Merge https://github.com/ThrawnCA/saber