[bug#34511] Add qtcolorwidgets

[pkill9]

This is a QT module that provides color management, e.g. a color wheel. 
https://gitlab.com/mattia.basaglia/Qt-Color-Widgets

I'm adding this as a dependency for drawpile which I will also submit once this 
package definition is merged. There is unfortunately no release available for 
this, however drawpile bundles it's own copy of qtcolorwidgets if it doesn't 
find one.

0001-gnu-Add-qtcolorwidgets.patch
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