Various fixes with usercard (and attachments), clean up

See merge request !170

Hide unknown type attachments, polish the upload preview styling

See merge request !168

More style fixes

See merge request !167

Unhide completions, strengthen shadows a bit, force the 0.1 shade to always span the full height, make usercard use correct borders.

updated ger translation

See merge request !166

Customizable themes

Closes #41

See merge request !165

Move custom theming from settings to style-switcher, remove usage of custom .css files, use styles.json instead.

Update theme editor to have 4 colors, rewrite the color setter, change a LOT of base16 assignments for better consistency.

Fix timeline softlock when switching from a loading timeline

See merge request !164

Updated german translation

See merge request !163

Use state object for user view instead of timeline.

See merge request !161

Also fetch user if not in the state already.

Remove leading @ in user search.

Closes pleroma#71

See merge request !160

Unbreak reply navigation

See merge request !159

Better handling of taller posts

Closes #40

See merge request !158

In-reply-to previews for posts on timeline

See merge request !157

Give tall notifications either a scrollbar (mentions), or just cap them and use a cool hider (fav/rt).

Move previews from conversation to status, put the reply preview arrow back on timeline statuses, add a spinner when the preview is still loading.

Update french translation.

See merge request !146

Get rid of the js to scale sidepanel, add an additional div and a css class to fix the same issue.

See merge request !156