Path saving: missed a parentheses
Path saving: move function definitions to include file
PathPlannerSettings: use an <options> section
Waypoint flash: reduce slot size to 64 bytes

The waypoints are 21 bytes.  However, the slot size has a 12 byte
header so that would require a 33 byte slot.  Since it is powers
of two we end up at 64 bytes, which is more future proof anyway.