WIP: yolov5 analyser

[breezykermo]

1. Build a custom mtriage image using the command ./mtriage dev build --whitelist whitelist.txt --tag yolov5_test
2. Create a custom YAML file called "examples/yolov5-test.yaml" that looks something like:

 folder: media/yolov5
 # select:
 #   name: Youtube
 #   config:
 #     in_parallel: false
 #     search_term: Tear gas
 #     uploaded_before: "2015-10-02T00:00:00Z"
 #     uploaded_after: "2015-10-01T00:00:00Z"
 elements_in:
   - Youtube
 analyse:
   - name: Frames
   - name: Yolov5
   ¦ config:
   ¦ ¦ in_parallel: false

3. Spin up a dev shell with your custom build of mtriage and this config using ./mtriage dev --tag yolov5_test --yaml examples/yolov5-test.yaml