Update transform chain in potree (calibration tool)

[vrajur-nd]

The calibration tool needs to replicate the same chain of transforms done in Cloud Transform (see LogParser#84).

Tasks:

• [x] Load calibration files and extract version numbers (see #194)
• [x] Determine which transform chain to use based on calibration file versions
• [x] Recompute transformation matrices with double precision each time calibration panels are updated
• [x] Chain transforms together and pass to shader as a material uniform in the pointcloud (this would be T_full presumably)
• [x] Apply the transformation matrices in the shader appropriately

[vrajur-nd]

Update 2020-08-19:

Changes have been added to branch: feature/issue196-update-transform-chain

The following tests were performed in order to successfully confirm functionality (done in conjunction with Cloud Transform changes - LogParser#85):

Test calibration panels using version 3 extrinsics with updated transforms to ensure that:

• Calibration panels allow visual calibration of pointcloud
• Reprocessing cloudTransform with version 3 corrections corrects pointcloud as desired

Backwards compatibility test (with version 2 extrinsics) to confirm that:

• Existing pointclouds on S3 look calibrated
• Calibration panels function can be used to recover the same extrinsics currently generated for datasets on S3
• Calibration panels can update existing version 2 extrinsics as expected
• Reprocessing cloudTransform with version 2 extrinsics produces calibrated pointclouds as expected as well

Testing notes: VAT Calibration Testing (Potree)

[vrajur-nd]

Changes merged in, closing issue.