tracker/nn: Add support for 3x3 pos/size cov matrix (and some cleanup) (#1845)

Adds support for 3x3 covariance matrices for position+size estimation.
My recent (unreleased) models output those instead of only component wise standard deviations.

Overall

    Accept 3x3 covariance matrix output for position+size
    Old models still worked fine in my testing
    Delete commented code which was there previously to support recurrent models. (Won't be used in foreseeable future)
    Delete leftover code for experiments with closed eyes detection (Likewise, I have given up on that / Is not really needed any more)
    Improve comments and code quality in the internal filter code

0 files changed, 0 insertions, 0 deletions