Add new options dialog for gpgol > 2010
* src/Makefile.am: Add new files. * src/addin-options.cpp: New. * src/addin-options.h: New. * src/dialogs.h: Add ID's * src/dialogs.rc: Add Dialog layout.
Reusing the old options dialog was too much hassle as that dialog
is part of the settings page in outlook.