Add Solarized environment themes and editor color schemes to Qt Creator

http://ethanschoonover.com/solarized

One article called it the Most Important Color Scheme in Computer History.

The guy spent six months working on it. I like the current dark theme in Creator, but I think such a well-designed, widely used palette would be better.

Editor support exists, but that doesn't affect the rest of Creator:

https://github.com/artm/qtcreator-solarized-syntax/blob/master/solarized-dark.xml

It also doesn't seem to apply cleanly (see attachment), with some caveats about Creator's behaviour in the notes:

Apparently, Qt Creator:

• ignores some of the attributes (e.g. background of CurrentLineNumber, foreground of SearchResult)
• derives extra colors from the style (for example for the backgrounds of nested blocks)
• derives gradients from some colors (e.g. Occurences). I haven't found a way to control all aspects of these elements. I let Qt Creator control the color of Occurences.Rename and (in the light style) of SearchScope)
  composes the gradients / backgrounds in some cases which makes the result differ from style color. This makes the current line background lighter then expected, for example.
• different types of background highlight which keep the thext color, mean I had to deviate from the canonical solarized.