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Achieve WCAG AA for text contrast

Nate Graham requested to merge work/ngraham/improve-text-contrast into master

Part of #149

Right now there are some labels that don't achieve WCAG AA, which specifies a text contrast of at least 4.5:1. The causes are varied, but this commit fixes them all to exceed 4.5:1.

In particular, standardizing on an opacity level of 0.75 raises the text contrast of those labels to:

  • 5.73:1 on the opaque gray window background color
  • 5.44:1 on a translucent background in Plasma with the current default wallpaper (though this will vary a bit with different backgrounds)

Now they meet WCAG AA.

The visual differences are overall very minor, but the Activity Switcher required a bit more work because the approach it was using to ensure text readability over arbitrary backgrounds couldn't be fixed. Instead I opted to use shadowed labels, like we do on the desktop:

image

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