Update transforms in potree to accomodate VAT parameter changes

Following on changes in Veritas#294, the reconstruction pipeline has been updated so accordingly the transforms in the shader used by the calibration panels needs to be updated as well.

Brain dump:

[x] Add new transform chain to shader to stay in sync with changes in Veritas#294
[x] Retain backwards compatibility with existing transform chain for older datasets
[x] Load in additional extrinsics files (if available)
[x] Logic of downloading version 2/3 of the calibration corrections file
[x] Think about related updates to calibration panels (makes sense to use smaller values? Move values to degrees instead of radians?
[x] Also think about reducing error accumulation by chaining multiple transforms together (see Veritas#371)

NextDroid / potree

Update transforms in potree to accomodate VAT parameter changes #193