Blit implemented as new optimized graph redrawing.

Plus more bug fixes and features. Check branch commits for details:

Autoscale disabled.

New axes limit to help visualize without autoscale (useless with blitting)

Added option to change plot color or hide it even when stopped.
Reduced graph blitting to 1 second because now Rpi can handle it swell
Deleted autoscale. It should be implemented like an auto-follow.
Critical section in AcquisitionGUIs fix.
Main GUI behavior fixing.

Start/StopAll bug fixed for channel 3.
Graph sleeping relocated, OnRefreshAll fixed as well.