* Delete includes/compat/normal/.gitignore, which excluded files
now located in various directories within the utfnormal repo.
* Remove "For NFC see includes/compat/normal" comments from
maintenance/language, replacing them with a note that "This
data file is used after normalizing to NFC."
Change-Id: I0ac990ec1a547b4c454ed738ce1dfffce0f53ba4
Instead of littering includes/ with stub back-compat aliases, house such
classes in includes/compat/.
Change-Id: I4c1b83e35c8d6c18777a4a3e17d81023915cfb7f