From https://github.com/Juanvvc/c172p-detailed/ release/2016.1
commit 3f33b88bb015a8ee685ab3178932d16d6e072410
A big Thank-You to the c172p-detailed team for their ongoing work.
These are then attached to buttons on the checklist dialog allowing
the user to ask the computer to execute the checklist step, which
they can observe.
Checklists may now be split into individual sections made up
of <pages> containing the <item> tags. Each page is displayed
individually with Previous/Next buttons to allow navigation.
Checklists items also support <marker> tags. These display
a marker when a ? button is pressed next to the checklist item.
The format is identical to that of the tutorial system.
Checklist items now support a <condition> element that evaluates
when the checklist item is complete, and is used to provide color
coding in the checklist dialog.
