Port the display part of the following commits to glitch-soc:
* 90f12f2e5a41115a9a756f9dd38054736080d4f9
* b170627ceb8838c358aef1fcca9673ce4aa61ab8
* 11697d68942db7b97a4c7384e4fb4148a97b9122
* 56eb5c3f344f0342ac6f26a05748bc21c585a729
Port the video-player part of 036dd98abb1fe6ae1d25ff0f3ecffe4dd9a79ea3 to
glitch-soc. MediaGallery part ignored since it has diverged quite a bit.
This fixes#423