Upgrade deps

Merge pull request #22 from Niek/dependabot/go_modules/fyne.io/fyne-1…

….4.0

Bump fyne.io/fyne from 1.3.3 to 1.4.0

Update deps, sign DMG

Move common files in submodule, do not spawn windows for commands on …

…Windows

Merge pull request #12 from Niek/all-contributors/add-dga711

docs: add dga711 as a contributor

Merge pull request #10 from Niek/all-contributors/add-dangr0

docs: add dangr0 as a contributor

Enforce AAC audio codec in output, fixes #6

Don't go over 100% progress

Use ffprobe JSON output, fix bitrate override

Updated build script and gitignore