Changed JSON communication for detected objects

[BrennoCaldato]

Changed JSON communication for detected objects

• The OBjectDetection and Tracker effects have a key "objects" in the Json that contains a dictionary of TrackedObjectBBox indexed by the object ID
• self.data now keep track of all changes in detected objects

Example of the JSON for ObjectDetection:

{ // effect parameters
        "id": 7QCETIYKEJ
        "selected_object_index": "2"
        "confidence_threshold": "0.5"
        "class_filter": "truck"
        "objects":{
                //these are the detected objects dicts
                "9FDETJYKEJ":{
                        "box_id" : "9FDETJYKEJ"
                        "x1": "50"
                        "y1": "50"
                        "x2": "100"
                        "y2": "100"
                        "delta_x": {...}
                        ...
                }
                "56BR38F17U":{
                        "box_id" : "56BR38F17U"
                        "x1": "50"
                        "y1": "50"
                        "x2": "100"
                        "y2": "100"
                        "delta_x": {...}
                        ...
                }
        }
}

[ferdnyc]

@BrennoCaldato

Just a quick question, probably something I'm missing: How is there a numeric selected_object_index if the objects are indexed by ID?

[ferdnyc]

Also:

Problems:
- Keyframe updates are slow when interacting with transform handlers
- Saving the project is also slow

Are these problems the change fixes, or... well, "causes", in effect? (IOW, are they problems before or after the changes here? ...Or both?)