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(core): add setNotifyInterval method to the Graber interface

Description

It adds an option in the videoQt Player to change the notifyInterval option. This is usefull to require frame through "setPosition".

Closes #596 (closed)

How to test it?

Add it in a application configuration xml file. Make use of an application which uses the "setposition" option to grab frames. Ask to grab a frame at a frame rate higher than 1/s. Verify that the all frames are grabbed.

Edited by Michaël KUGLER

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