-Moved the methods that handles protobuf data from Tracker to KeyframeBBox
-Displacement and scale keyframes are now properties of KeyframeBBox
-Changed interface that updates the KeyframeBBox properties.
It's now possible to adjust the tracked bounding box from the preview window. Some work is needed to make it generic to the ObjectDetection effect and future effects
Also integrated a basic the tracker Effect with the UI, changed the effect creation to use Json messages, and added the ProcessingController class to handle thread communication