Offline mode, improvements to upload flow, support for albums

As stated in previous releases, there are still quite some issues with the Pixelfed API causing some things not to work. Most notably:

• 2FA does not work
• likes, shares, etc do not work well
• some lists repeat endlessly the same few entries

Bug fixes and improvements

Just another alpha release including some bug fixes and some improvements.

The notes about what's broken from the previous release notes still apply (although #177 has gotten a bit better).

Happy birthday fediverse!

The fediverse is 12 years old, so we decided to celebrate (slightly late) by doing an alpha release.

Broken things related to API problems: search repeats results, likes/shares don't work correctly, can't click on a hashtag to see a list of posts with that hasthag, can't see comments, 2FA-protected accounts cannot be used (of course these things could also be broken client-side, but that's more of an academic question at this point)

Broken things that might be solved with changes server-side: thumbnails saying "no preview available" sometimes (more debugging is needed to pinpoint the problem)

Bugs we know of #161 #141 #177, look through the issues to see what we still want to work on and what we know should be better

We haven't tested the app with rtl languages yet, expect things to break there (reports welcome)