Experimental Blurhash support

Add support for more m.room.events in timeline

Currently translated at 100.0% (241 of 241 strings)

Translation: Nheko/nheko
Translate-URL: http://weblate.nheko.im/projects/nheko/nheko-master/en/

total + first member shows as one too many room members

i was confused when a room with me and two friends showed as "user1" and
3 others.

* Upload nightlies to a matrix room

* Add branch to upload name

* Update README with new nightly location

0.7.0 dev merge to master

It made some messages unreadabe. We loose proper highlight colors, but
we will have to do for now, until I can figure out, why the TextArea
doesn't work.

fixes #30

This may increase the db size by a factor of 1000 in the worst case and
it will need some fixes, when we decide to not show some events in the
timeline, but it should work for now.

Only consider the room as unread, if there is a message in the room and
only consider message and sticker events as messages.

fixes #65

Add Guix build and installation instructions

This may still not raise the application correctly on some WMs, because
they don't allow disturbing the user with windows popping up. I don't
think we want to work around that.

fixes #84
fixes #113

fixes #97
fixes #51

remove setStyleSheet calls directly from widget code