Add missing frame_time argument to ObjectTracker.match_and_update()

[SpangleLabs]

And some little type hints.

Was just digging through the object tracker and noticed the args of the abstract class don't match the implementations.

I wondered whether more of the definition (including two identical methods between the implementations) should be pulled up into the superclass too, but that's a question of architecture. I wasn't sure if both implementations are used anymore

Also, I wondered whether you might be open to me making some PRs defining some types and type hints for the detections and boxes and stuff?

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[blakeblackshear]

PRs defining types and type hints would be greatly appreciated. Thanks for the PR.