#18 Add Sub/Superscript, strikethrough to AIHTMLDecoder

[ender]

Adds support for strikethrough (), subscript
(_{), and superscript (^{) to
AIHTMLDecoder/AITextAttributes. The official AIM
client doesn’t have options for these, but I have seen
people using them in their profiles and such (and Gaim
supports raw html in profiles, so including support for
these is a plus).}}

Modified files: AIHTMLDecoder.m, AITextAttributes.[m,h]

[ender]

diff for AITextAttributes.m

[ender]

diff for AITextAttributes.h

[Evan Schoenberg]

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Need the AIHTMLDecoder patch, too :)

[ender]

oops, forgot this :)

[Evan Schoenberg]

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Sorry that took me a while - for some reason it never emailed me when
you added the AIHTMLDecoder patch.