Jinja2.ext.loopcontrols support

Been looking for a way to add break to break out of forloops without letting a ranged loop run until it finishes.

Turns out there is now a loopcontrol module in jinja so we could break out of loops.

https://jinja.palletsprojects.com/en/3.0.x/extensions/#loop-controls

would be nice to see this added to klipper.