Anycubic i3 Mega - Pause At Height

This is a remix of JuliJanz work to update the Cura built in python script for pausing the print at a specified height or layer. JuliJanz's script was based off the older version of Cura's built in script, so it didn't seem to correctly manage the Z axis, which caused the prints to fail after resuming.

To fix this, I altered the new Cura script and pulled JuliJanz's changes in. The built in script is able to pause the Anycubic i3 Mega, but unable to resume the print from the touchscreen. For some reason, the i3 Mega doesn't recognize the M0 command which is the one the built in script uses. To fix this, JuliJanz implemented a configurable pause during which the operator needs to press the pause button on the touchscreen. This way the print is never actually paused, instead it just waits for a little bit until the user manually pauses it. After the user is finished with whatever they were doing, whether they were inserting fabric or changing the filament, they simply click continue