Move headers other than config.h after HAVE_LIBLIGHTGREP check, since
they don't need to be read if HAVE_LIBLIGHTGREP is false.
Cleanup.
Combined UTF-8 and UTF-16LE email patterns.
* Collapsed BITLOCKER patterns into one.
* Collapsed base16 patterns into one.
* Removed non-IP patterns.
* Collapsed URL patterns into one.
* Added some context FIXMEs.