Merge pull request #527 from jamrial/srat

feat: add srat box

Merge pull request #522 from rrhan0/main

chore: updated demo links in README.md

fix: typing of getBox

fix: resolve an issue with `getBox` type

feat: add wave box from quicktime

closes #505

fix: handle mp4a in quicktime mode

fixes #505

feat: implement writing logic for `dOps`

fix: correctly detect fragmented files

- Display total fragment duration on the demo

closes #504

fix: prevent an infinite loop in processSample

fix: better type inference via getBox(es)

relates to #499