Changed the Common::IniFile class to work with 7-bit character INI files only.

Changed the Common::IniFile class to work with 7-bit character INI files only.
* Strings and byte arrays are now escaped;
* Strings and byte arrays can now be in single or double quotes; makes it possible to
  have leading and trailing spaces.
* When saving string or byte array values with leading or trailing spaces, automatically adds
  double quotes.