formatting: Make indent() more useful
deps: Output one dep per line
deps: Look up deps in pkg_resources
deps: Remove old manual deps checkers
deps: Move GStreamer to the bottom
deps: Group GStreamer elements by found/not found
deps: Rename --list-deps to --show-deps
Merge pull request #418 from jodal/feature/show-deps

Update --show-deps to list deps of extensions