Handle visually similar images.

[vegetableman]

MediaRecorder is the right option for recording frames but due to compression applied by video codecs during the recording, even visually identical frames will differ in this data and end up being marked as dissimilar and packed separately — increasing the size of the packed image. Refer #2.

There are three ways to go about it:

• Fix the diffing so that it takes in to account visual similarity.
• Add a mechanism to detect visually similar matches during packing similar to matchTemplate.
• Find a workaround so that we don't end up with dissimilar images in the first place through mediarecorder.