closedcaption: Add SCC parser and encoder plugins

4 jobs for master in 11 minutes and 51 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Lint
passed #105438
rustfmt

00:00:19

 
  Test
passed #105439
test 1.31

00:04:00

passed #105441
allowed to fail
test nightly

00:03:29

passed #105440
test stable

00:04:01