Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8696>
dragscroll
Patch suggested by Rubén Gonzalez Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7999>
This adds `gstdump` and `gst-dots-viewer` server, see the README for more details about what those tools do. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7999>