Add Colors runner

This allows to search for colors and display a colored circle of that color. The SVG named color is displayed when available alongside RGB/CMYK values.

Activating the result copies the color to clipboard (both text and a proper QColor). Drag and drop (e.g. to a graphics palette) is also supported.

The color circle is drawn using a proper QIconEngine which ensures that the circle is rendered crisp regardless of DPI or icon size (KRunner vs. Kickoff).

Supported input:

• hex notation
  • both with (#AARRGGBB) and without (#RRGGBB) alpha channel
  • three letters (#RGB turns into #RRGGBB)
• instead of hash (#) also 0x and no prefix is allowed
• rgb notation
  • both with alpha (4 numbers) and without (3 numbers)
  • with or without parentheses
  • separated by spaces and/or commas
• SVG named colors (e.g. maroon, fuchsia, lightseelblue)

Comes with an autotest.

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No more googling colors ;)