Try to get PositiveColour/NegativeColour/NeutralColour into QPalette upstream
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(alternatively we can do what OS X does and have a "systemRed, systemGreen, systemPurple,..." in the palette which personally I quite like)

We need to do some platform research so that we can do an initial mapping.

GTK has these concepts for icons, so presumably in the palette
Android has an Error colour but only that
OS X has no similar concept, but instead has 16 system colours

davidedmundson claimed this task.

@hein brings this up in the VDG chat every now and then when we start talking about colorscheme colors: https://www.eikehein.com/colors.pdf

That PDF actually recommends a set of 16 system colors (foreground and background) that can be used freely, but have suggested uses.