Update release notes for final 3.12.00 release
(cherry picked from commit 3b825dcf38426884a7ff9f48314f039502206c27)

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Increment version for 3.12.0 release
(cherry picked from commit 85a1b8a50b5ac85032359c93dd9514c714f4640e)

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>