TODO
add : to combo text
preparation: decouple AppearanceOptions from FirmaOptions
add appearance action
icons
formatting
sign dialog
appearance editor
appearance dialog - wip
organize variables
AppearanceDialog properties
AppearanceDialog bindings
decouple previewtask
reafactor: allow fire Action
i18n options name
sample certificate
i18n messages in dialogs
add firePropertyChange
fix typo; toText method
applying options to a SignatureAppearance - wip