settings dialog: Remove dark theme setting
MainWindow: Keep the menu button's relief
TweetListEntry: Fix margin-bottom of the avatar

This centers the avatar in scenarios with only a small amount of text.
Add new filter icon

Kindly provided by Allan Day.
user-list-entry: Add some margin

... to make it look more like the TweetListEntrys, especially in the
search page.
TextButton: baseline-align the label
tweet-list-entry: Unify the avatar's horizontal margins
TweetListEntry: Fix the hover button margin_top

Since the grid inside a TweetListEntry now has a margin_top of 6, we
need to adjust the margin_top of the hover buttons when hovered or
adjusted at construction time.
ReplyIndicator: Fix failed frame clock assertion

We only need to add the tick callback in case there are replies.
style: Transparentize the bg of tweet detail buttons
style: Fix hover button padding
compose-window: refine spacing

Make the avatar/textview spacing match that of the TweetListEntry that
is possibly below it (when replying).
Switch more_buttons to go-down-symbolic

open-menu-symbolic only exists in adwaita-icon-theme 3.14
TweetInfoPage: rework some style bits
tweet-info-page: Reduce the text_label's margin_top
Merge branch 'master' into design

Conflicts:
	data/symbolics/Makefile.am
	data/symbolics/corebird-filter-symbolic.svg
	ui/tweet-info-page.ui
	ui/tweet-list-entry.ui
Revert "Revert "refine message list spacing""

This reverts commit ccadf8eac05ad04cd736e8a0dea5fe4e9f2b63c0.
Revert "Revert "use adwaita icon theme""

This reverts commit 644b4eee636793def30a4bcae90ee6495f0ef07c.

Conflicts:
	data/symbolics/Makefile.am
	data/symbolics/corebird-filter-symbolic.svg
	ui/tweet-info-page.ui
	ui/tweet-list-entry.ui
Revert "Revert "TweetListEntry: Remove custom draw implementation""

This reverts commit 4de03200d0d3b1e886044fc0692090f751fcf688.
Revert "Revert "css: Give each tweet a border-bottom""

This reverts commit b8545afd3422188fae88001c7d2925654e989316.