must be version 1.0.1
internally ImageLocator should be used
fixed: background observe now runs in a thread (as it should do ;-), added: at normal script termination all running observers are stopped.
fixed some problems with preview on multi-monitor setups
observers now are cashed, to close them on exit
to support the hack from the preview target offset
added: convert Location to Point
Revert "Update README.md"

This reverts commit 719cee78a07c92036ff21dd3e1d62dc3c22f4873.