This makes usage of RLS/rust-analyzer on the repository much faster and less annoying as the docs don't have to be included and removed on every change.
Only automatic bindings for now, which is enough to allow implementing a simple rtsp-server example. Depends on https://github.com/sdroege/gstreamer-sys/pull/8 Uses a new gir feature proposed at https://github.com/gtk-rs/gir/pull/539 to make doc regeneration easier. Fixes https://github.com/sdroege/gstreamer-rs/pull/80