first commit for offline marker tracker
first working version of markerdetection with prefetching
varous bugfixes detected during developement
fixed typo
fixed typo
fixed atb frame index value type
added cache list a class for handling caching data
more work on offline marker display
refactored code. Made version of marker tracker called offline marker tracker.
adding offline marker detector
typo fix.
small fix
trying to fix frame seeker
small fix
made file seeking more robust.
small fix
more robustness improvement for marker tracker cacher
added missing import.
various fixes
adding theckness option to lines