fix(synch): make loop work on SFrameGrabber and SMatricesReader
Description
*reset the frametimeline in the SFRameGrabber when it reached the end and is in loop mode. This will reset the TL synchronisation
- add a loop option in the SMatricesReader, and a toggleLoopMode slot, and add the same mechanism as for the SFrameGrabber
- enhance the pause mechanism of the SMatricesReader to fit the SFrameGrabber mechanism
Closes #966
How to test it?
run tuto17simpleAR
play a video from a file
click on loop button and verify that it loops well