[main] Timestamp issues in CSV files at high fps recordings with stereo cameras

[kheki4]

Probably stereo cameras are needed, but the problem is worth checking if perhaps the cause can be found by inspecting the code only.

See issue on main branch:
openPupil#41

[kheki4]

Could not reproduce uwing a recent Release build (commit 14067a2) though this might still exist, but it would be really hard to debug because in any Debug build, the application runs with a ~10-15x resource footprint depending on FPS (and given that it is a stereo case) the problem should be easier to find by solely inspecting the code.
Issue now kept for later