Merge-request: 900
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

This patch should fix auto-indentation (Ctrl+I) for the most usual
cases. Before this patch, lines were never dedented, resulting in e.g.

Rect {
  Item {
    }
    Item {
      }

Requires a lot of trivial forwarding.

avoid qstring functions. instead, use preallocated strings and pointers.
now the majority of the parsing time is spent in qt (qfile and qtextcodec).

Fixes the issue where it would stay the color of the previous color
scheme until you change the cursor position.

The creation of the styles directory was in two places and the importing
of an old customized style didn't have any safety when the name
'customized.xml' already existed.

Patch based on the analysis by Grigory Zagorodnev.

Task-number: 253974

Not all colors inherit the color from the standard text. For example
line number colors.

So people's customized color schemes don't get lost, but get converted
to the new format instead.

We now at least follow what other Mac applications do.

For this we needed to get rid of using QToolBar.

Makes sure that all files recognized by the CppEditorFactory get the
proper icon.

this gives a rather amazing performance boost to the pro reader