debian: make the copyright file machine readable

debian: make the copyright file machine readable

Debian introduced a machine-readable copyright file a while ago.
Convert the general copyright file and the package-specific ones,
splitting the info that belongs to the package-specific ones.
Drop debian/e2fsck-static.copyright because that does not have a
file set that is very distinct from the general source; it would
just replicate parts of it.

This change adds some missing licenses that have to be documented
according to Debian Policy §12.5 as well as the copyright info for
many files.

Signed-off-by: Viraj Shah <viraj.shah@linutronix.de>
Signed-off-by: Bastian Germann <bage@linutronix.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>