Falkon: Add qt quickcontrols{, 2} as optional dependencies for QML extensions

[Juraj Oravec]

Hello,

I would like to ask potential Falkon package maintainers to add qtquick 
related packages as an optional (?) dependency.

I do not know how qtquick is structured, so I can only guess.

For start I would like to add these optional dependencies:
- quickcontrols
- quickcontrols2

Or maybe only the "quickcontrols2"? Here, my knowledge is lacking.

This is because Falkon extensions can be written in QML and distributed 
through falkon store[1] and they can use QtQuick for GUI.

On this thought, adding "kirigami" might be a good idea as well.

Thank you for your help.

Best regards,
Juraj

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[1] https://store.falkon.org/
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