Re-work config file

[richardssam]

Add an explicit section for tests that would be a dictionary so that an example config would look like:

tests:
    test_h265_color:
    app: ffmpeg
    comparisontest:
    - testtype: idiff
    - testtype: assertresults
        tests:
        - assert: less
        value: max_error
        less: 0.00195
    description: h265 color tests of different pix-fmts
    encoding_template: ffmpeg -y {input_args} -i "{source}"              {encoding_args}
        -y "{outfile}"
    name: test_h265_color
    sources:
    - ../sourceimages/chip-chart-1080-noicc.png.yml
    - ../sourceimages/chip-chart-1080-16bit-noicc.png.yml
    - ../sourceimages/smptehdbars_16.png.yml
    suffix: .mp4
    wedges:
        yuv444p10lex265: &basex265
        -c:v: libx265
        -vf: '"scale=in_color_matrix=bt709:out_color_matrix=bt709"'
        -color_primaries: bt709
        -color_range: tv
        -color_trc: bt709
        -colorspace: bt709
        -pix_fmt: yuv444p10le
        -preset: placebo
        -x265-params: lossless=1
        -tag:v: hvc1
        -profile:v: main444-10

        yuv444p12lefullx265:
        << : *basex265
        -vf: '"scale=in_range=full:in_color_matrix=bt709:out_range=full:out_color_matrix=bt709"'
        -color_range: pc
        
        videotoolbox_h265_bgra:
        << : *basex265
        -c:v: hevc_videotoolbox
        #-vf: '"scale=in_range=full:in_color_matrix=bt709:out_range=full:out_color_matrix=bt709"'
        -color_range: pc
        -colorspace: rgb
        -profile:v: main
        -pix_fmt: bgra

    test_h265_color_420:
    app: ffmpeg
    comparisontest:
    - testtype: idiff
        compare_image: ../sourceimages/chip-chart-1080-16bit-noicc-yuv420p10le.png
    - testtype: assertresults
        tests:
        - assert: less
        value: max_error
        less: 0.00195
    description: h265 color tests of different pix-fmts
    encoding_template: ffmpeg -y {input_args} -i "{source}"              {encoding_args}
        -y "{outfile}"
    name: test_h265_color
    sources:
    - ../sourceimages/chip-chart-1080-16bit-noicc.png.yml
    suffix: .mp4
    wedges:
        yuv420p10le: &basex265
        -c:v: libx265
        -vf: '"scale=in_color_matrix=bt709:out_color_matrix=bt709"'
        -color_primaries: bt709
        -color_range: tv
        -color_trc: bt709
        -colorspace: bt709
        -pix_fmt: yuv420p10le
        -preset: placebo
        -x265-params: lossless=1
        -tag:v: hvc1
        -profile:v: main444-10

reports:
  description: This is testing h265 color encoding.
  directory: hevc-color-encode
  name: hevc-color-tests
  templatefile: colorweb.html.jinja
  title: Ffmpeg encoding guide tests

I might also remove some of the duplicate info, such as the name, and in the reports, the directory and name fields.