profile-page: Fix follow/more-button height
refine message list spacing

It was a bit too tight before - more padding makes it easier to
read and feels lighter.
use adwaita icon theme
add a border to the sidebar

This makes the sidebar more distinct.
sql: Show column values on sql errors
list-statuses-page: Use symbolic refresh icon
TweetListEntry: Remove custom draw implementation
account-list-entry: Remove xpad + label

xpad is deprecated and we never used the label anyway
css: Give each tweet a border-bottom
css: Fix the pixbuf-button box shadow
tests: Add a hashtag filter test
Merge branch 'master' of https://github.com/baedert/corebird