increase periodical frame period; render on shock
fix multiplication bug in setShock()
fix warning about implicit conversion
stop tick timer after experiment ends itself
removed temporary avi option, remove VC creations

(might add AVI option in the future?)
update readme
tweak detection, delays, rendering
allKeypoints() now also returns only in-mask keypoints
workaround to fix crashes on windows

no more shared single captured frame, as accessing it made KT crash on windows
tracking tab now also captures a new frame every refresh