Add new icons for signature state
* COPYING-ICONS, src/icons/Makefile.am, src/icons/README.icons, src/icons/emblem-information-64.png, src/icons/emblem-information.svg, src/icons/emblem-question-64.png, src/icons/emblem-question.svg, src/icons/emblem-success-64.png, src/icons/emblem-success.svg, src/icons/emblem-warning-64.png, src/icons/emblem-warning.svg: New. * src/dialogs.h, src/dialogs.rc: Add new ids / data.