Addressing some PR comments.

Changed styling of the adder a bit.
Changed annotatoin icon click on the toolbar to create a new annotation instead of a new page note, when text has been selected.
Added a for attr for icon labels in the adder.

getting scripts/update-icon-font from branch: annotation-card-design-refresh

comitting new woff and icomoon css

showing adder in the middle top of selection rather than mousePosition.

Revert "showing adder in the middle top of selection rather than mousePosition."

This reverts commit 99491e42eb4103953f0cfa87afdd37e5ac8ece4d.

showing adder a little above the mouse position

check for end of text selection after current event loop tick

only show tooltip for toolbar and not adder

cursor pointer for adder labels

some styling

cleaning up css nesting.

more styling :/

Eliminate deadzone in adder buttons

 * Remove the margin between the adder buttons and the
   edge of the toolbar, and apply padding to the buttons instead.
   This removes the deadzone between the edge of the visible toolbar
   and the clickable area.

 * Add pointer cursor for the buttons

 * Use flexbox for laying out the toolbar for consistency
   with how the Adder is laid out

 * Use a transparent background for the individual buttons, so
   that their background does not obscure the rounded borders
   of the toolbar.

removing console.log