Added the taglib/aiff (.aiff) MIME type
Added the taglib/aiff (.aiff) MIME type

.aiff is a common extension for AIFF files, and it was missing
from the TagLib.Aiff.File declaration. This PR adds it.

First noticed by https://github.com/mono/taglib/pull/20

hwahrmann/taglib-sharp,archrival/taglib-sharp,archrival/taglib-sharp,punker76/taglib-sharp,punker76/taglib-sharp,mono/taglib-sharp,hwahrmann/taglib-sharp,CamargoR/taglib-sharp,CamargoR/taglib-sharp