Add functions to convert color format

[qgib]

Author Name: Harrissou Santanna (@DelazJ)
Original Redmine Issue: 16073

Redmine category:expressions

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It could be nice to have functions to convert color from one format to another ( rgb(a), hsl, hex...)
For example, it could help to display @symbol_color value in another format than hex.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• easy_fix was configured as 0

[suricactus]

Not sure if this feature is really needed, as the main way of working with colors is in hex. There is already the color_part function, that provides flexibility to extract whatever one wants from a given color.

color_part('#ff00ff', 'hue') || ', ' || color_part('#ff00ff', 'saturation') || ', ' || color_part('#ff00ff', 'value')
'300, 100, 100'

[github-actions]

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[github-actions]

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