Mesozoic Pre-Beta 2 — audio additions

Extinct animal calls are artistic recreations, not authentic recordings. Existing Mesozoic assets retained and trimmed; their pre-existing licensing status is unchanged. New sources are public HQ MP3 previews, converted to short mono OGG Vorbis clips with fades, normalization and pitch changes.

alligator: craigsmith — CC0-1.0
https://freesound.org/people/craigsmith/sounds/675512/
Source SHA256: fb809f5dff009dfd6fb97c4492d58561743c5fd448441fd0ebf54721bd396683

elephant: craigsmith — CC0-1.0
https://freesound.org/people/craigsmith/sounds/675498/
Source SHA256: a2b3e688e2def854a7b77fcbc6f8c8406f1d87743c3a4296592dcc0b3a7251e7

bird: qubodup — CC0-1.0
https://freesound.org/people/qubodup/sounds/812035/
Source SHA256: 67d3b8acb92907c04c9a338db00b91852c264e11803de318309d94b2c7e24202

breath: dav0r — CC0-1.0
https://freesound.org/people/dav0r/sounds/346932/
Source SHA256: c034bf1c4df94903d4d9fc7cbd3faf32ec18db309ad98244863d4e27fb2f5e1f

mosquito: allistersandwich — CC0-1.0
https://freesound.org/people/allistersandwich/sounds/525122/
Source SHA256: abf7ef4db63848d9a67381322784a0cfa18cb22812bba6a8c7815f61e46bf844

License: https://creativecommons.org/publicdomain/zero/1.0/
Mosquito source is synthesized; human NPCs use breathing samples. Six music discs reuse the original Mesozoic music under MUSIC_LICENSE.md.
