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[ADD] Multithreading implementation has started. ATM there is only a speed up of 2, meaning you will gain the result in half of time, but it scales unfortunately not very well, so having 15 cores on this job will also result only in the half of the time.. So this clearly need to be reworked.

[ADD] - added new callback for automatic propagation of viewport updates along multiple cameras or nodes supporting it.

[STYLE] "if (" --> "if("