Adds filtering of partial matches to classifications/detections

[bhaney]

Using a wildcard character, you can match to partial classification/detection labels.

For example,
if your config is

{
  "camera": "my-cam",
  "vision": "my-cision",
  "classifications": {
    "COUNTDOWN*": 0.9
  }
}

Then images that have the classification label "COUNTDOWN: 20 s remain!" will also be saved

[erh]

can you add a note to the README?

[bhaney]

can you add a note to the README?

done