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Files that belonged to PuRe, PuReSt and the evaluation framework were
removed through a filter-branch, but rebasing these commit's changes mean
solving the conflicts throughout history, so we just do a single commit
here.

libuvc: 69e45682220ff93abc6d675acfaa8fc6de8f5fca

uvcengine: fce1f275eb53cc87725f7232944813bc36da75cf