Automatically add metadata (ID3?) tags for date and artist

[nekohayo]

So that apps like Nautilus (and others) can display the Year of the recording, it would probably be good to encode the date into the metadata (which would be more precise than just the year), and while we're there, the artist could be set to match the system user's full name by default.

Unfortunately the title can't be guessed (unless you prompt the user about it, I guess)... but at least year and artist would already be taken care of.

[ryonakano]

Great, thank you for your idea.

[ryonakano]

Notes to myself:

• https://valadoc.org/gstreamer-tag-1.0/Gst.Tag.html
• https://valadoc.org/gstreamer-1.0/Gst.Tags.html
• https://valadoc.org/taglib_c/TagLib.html