get car positions from lap chart PDF (fix #19)

[harningle]

This fixed #19

It's very hard to determine the lap of cars from Race History Chart PDF. The PDF ranks cars by their absolute positions. That is, if car A is physically in front of B, A is ranked above B, regardless of whether B is lapped by A or not. When we have both lapped cars and cars in pit, it's hard to tell if a car is lapped, and thus we cannot assign the correct lap No. to lap time (Probably we can, but I wasn't able to find an easy way to do this.)

So I now use Race Lap Analysis as the source for lap time data. This PDF explicitly gives the lap No. of cars so no need to determine if a car is lapped. However, no position data is available in this PDF, nor lap 1's lap time data.

So we further use Race Lap Chart PDF to get the car positions, and get lap 1's lap times from Race History Chart

[harningle]

this also fixed the parsing error for 2023 vs 2024 quali final classification PDFs: the 2023 one has one more col. so we need to make sure the cols. are aligned properly