MIME db: make video/ogg sniffing more specific

Check the codec in the first Ogg page for known video codecs. If none is
found, the file will be identified as audio/ogg instead.

Fixes #8702.

Merge branch 'package-management'

Conflicts:
src/preferences/network/Jamfile

Move MIME DB creation from build_haiku_image to jam build system

* build_haiku_image: Remove MIME DB creation code.
* Rename beos_mime source directory to mime_db.
* Add rules to build the MIME DB i

Move MIME DB creation from build_haiku_image to jam build system

* build_haiku_image: Remove MIME DB creation code.
* Rename beos_mime source directory to mime_db.
* Add rules to build the MIME DB in the source directory's jamfile.
* Add MIME DB directory to haiku.hpkg in data/mime_db.

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