Skins: add effect chain menu button to Deere, polish in Tango

[ronso0]

[daschuer]

This is how it looks like without a super knob and the menu gear highlighted.

I have no strong demand here to change something in the last minute. Just for info what I had in mind when first looking it.

• The gear looks a bit lost compared to the other controls squeezed to the border.
• The hover effect does looks not natural, because unlike other buttons the gear has no border.
• The Deere gear looks bold compared to most other icons.

Please give me a hint when you consider it as ready.

[ronso0]

Thanks for taking a closer look (than I did in bright sunshine ; )

I polished the gear icons a bit.

The hover effect does looks not natural, because unlike other buttons the gear has no border.

The gear looks a bit lost compared to the other controls squeezed to the border.

Yeah, I know, but at least its consistent with the Skin Settings toggle. When adding a border we'd need to make the icon smaller and I thnik that's not worth it. Tbh I'm not very motivated to work on Tango anymore, the mirrored layout and dealing with size policies is just a nightmare :| (I'll fix bugs of course)

I think this is ready aka good enough to be merged.
Maybe I'll come back for a bit of polishing.

[daschuer]

Thank you for polishing. LGTM.