#9 Add options dialog

[Peter]

Add an options dialog where options for Fangs can be
set. Right now the announcements have a grey background
but this should be user settable.

Other settings could be
- highlighting of certain types of items.
- output font

[Bohdan R. Rau]

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...And provide some simple features from JAWS:

- optional expanding ABBR and ACRONYM
- behaviour when both ALT and TITLE are present in object