Added missing categories with customized colors for Field, Occurences,
Static and VisualWhitespace.
Removed highlighting for the 'Local' category, since at least I consider
the white names a little messy. In general we've considered the
highlighting of locals less useful than highlighting the members.
Task-number: QTCREATORBUG-2490
This color scheme is based on the vim Inkpot color scheme, originally
created by Ciaran McCreesh:
http://www.vim.org/scripts/script.php?script_id=1143
It was adapted for use by Qt Creator by Jan Kundrát and subsequently
updated by Campbell Barton.
Task-number: QTCREATORBUG-2490
Also, defaults formats are now applied to any format that hasn't been
defined in the color scheme file. This allows a color scheme to fall
back on the default selection color, for example.