Adding support for new image color space

To add new image color space need to dispatch image_color_thresholder_app with that type.

1. Need to create instance of PlotProp structure for required type. Here is explanantion for PlotProp fields

   • type: Required color space type(must be <:Color3).
   • alpha_type: alpha type for color space type
   • type_string: String representation of type.
   • color_properties: Field names of type.
   • names: Names to diplay on histograms y-axis.
   • lengths: Length of each channel, used in histogram bins.
   • range: Each channel min and max values.
   • color_range: Color range for each channel to represnt in hisograms.
   • background_color: Background color to replace in preview image. Use black color as backgound. Use zero(type) if not works enter values manually.

2. Call _color_thresholder with image and instance of PlotProp.

Here example code for YCbCr format

using ImageColorThresholderApp: image_color_thresholder_app, PlotProp, _color_thresholder

function image_color_thresholder_app(img::Matrix{YCbCr{T}}) where {T}
    plotprop = PlotProp(
        type=YCbCr,
        alpha_type=YCbCrA,
        type_string="YCbCr",
        color_properties=(:y, :cb, :cr),
        names=("Y", "Cb", "Cr"),
        lengths=(220, 225, 225),
        range=(
            (16, 235),
            (16, 240),
            (16, 240),
        ),
        color_range=(
            (YCbCr(16.0f0, 128.0f0, 128.0f0), YCbCr(235.0f0, 128.0f0, 128.0f0)),
            (YCbCr(210.0f0, 16.0f0, 146.0f0), YCbCr(41.0f0, 240.0f0, 110.0f0)),
            (YCbCr(165.5f0, 166.0f0, 16.0f0), YCbCr(81.5f0, 90.0f0, 240.0f0)),
        ),
        background_color=YCbCr(16.0f0, 128.0f0, 128.0f0),
    )
    _color_thresholder(img, plotprop)
end