Add waypoint lap field via Parameter field

Waypoint tracking in sprint maps kind of sucks, since waypoints from all over the map (for each lap/section's corresponding checkpoint) are used to factor in position. This allows use of the Parameter field to denote that a waypoint should only be used for position tracking on the corresponding lap/section, which can be used in sprints to fix a lot of the tracking issues.

The field is 1-based (so a Parameter of 1 means the waypoint is only used on the first lap) and 0 means it works on all maps as usual, so this shouldn't break any existing maps.