Update styling for popups

Sync ffmpeg with Github Actions build

Clean up singular hanging thread after every ffmpeg run

In figuring out how to do this, I upgraded the Emscripten
version used to compile this project to the latest version

Add documentation

Update border width

Update to version 1.0.2

Update to v1.0.1

Update CRLF to LF

Fixing newlines

Update version to 0.0.7

Tweak image/audio file names