remove redundant icon classes...

...and give the dropdown a consistent active icon
smart spacing around toolbar icons

When an icon font element is empty, it contains no spacing. Otherwise,
use the space character I added in a previous commit, to automatically
add a single space between the icon and the text.
dropdown drop shadow
trim unnecessary bottom annotation padding
remove dead magicontrols styles
simplify/snappify the control animation
move timestamp inside
revisiting -- privacy should float right...

... and thereby be in line with the user or prompt
language
re-align dropdowns after pulls
no change, better markup
make it possible to override the font icon class

This is a little bit ugly, but it makes multiple font icon mixins
override one another, which is helpful for things like custom dropdown
icons.
avoid cutting off menus that hang outside threads

Nice trick here -- by using the hover state we hopefully ensure that
it's hard to activate a menu that gets cut off by the overflow.
more actions at bottom
don't offer flag when the user can delete