- Compile with QT_NO_CAST_FROM_ASCII, fix
  single character strings
- Remove special character from constants.h,
  fix constant names
- Fix tr() errors.
- Clean include directives
- struct -> class (coding style)

Change-Id: Id6108a03312bdecc6df3015b5a12653c95390647
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>