#89 Should use Delphi 2006 widestrings and widestrutils

[Tony Caduto]

There is a incompatibility with the Delphi 2006 widestrings unit and the synunicode unit.
Specificly the synunicode twidestring list is not compatible with the delphi 2006 widestrings.twidestringlist.

Synedit needs to have compiler directives to use the native delphi versions of these methods when running on Delphi 2006 and above.

The synunicode.twidestringlist is also missing the strict delimiter option that was introduced with D2006 and the native delphi verion of twidestringlist does support this.