Port d185f3ddaf to glitch-soc

This doesn't change anything for glitch-style fields, but those will go
away eventually

The rationale behind this is that if the user wants to report violent media,
they might not want to see it repeatedly. The “sensitive” property is still
kept, displaying different messages for hidden media depending on whether
they are marked as sensitive.

Port c88e12fca6 to glitch-soc

Port ad5d3134e4 to glitch-soc

glitch-soc-style still in backup, both sharing the same SCSS style

Inspired from b6003afcdb but using component
properties instead of redux store for hidden/revealed state.

Backports daefbd66a6

Port ff7941e652 to glitch-soc

Port the display part of the following commits to glitch-soc:
* 90f12f2e5a
* b170627ceb
* 11697d6894
* 56eb5c3f34

Port the video-player part of 036dd98abb to
glitch-soc. MediaGallery part ignored since it has diverged quite a bit.

This fixes #423

Port ecdac9017e to glitch-soc

Port the UI part of 76f3d5d16b to glitch-soc

Unlike boosts and like, there is no confirmation dialog as misclicking
can be recovered without another user seeing it.

Port fa5c867e0e to glitch-soc

Port 4e929b2d17 to glitch-soc

Port bf7757cbbc to glitch-soc

Port 6a895e1ab3 to glitch-soc

Port 913a38111f to glitch-soc

Backport 3987bd18a4 to glitch-soc

Port WebUI changes from 58cede4808

Port 9110db41c5 to glitch

Port 5131012505 to glitch

Ports 219aac7800 to glitch-soc

Port 379cdfaac5 to glitch-soc flavour

Port 41a01bec23 to glitch-soc

Ports cfa9b6e13a to glitchsoc

This is a backport of b6af88192f to the glitch flavour.