Add toggled event, fire callback on toggled

Added a toggled event to match Tabs (fires after toggle completes).

Added callback being fired when active item is clicked (previously only
non-active items being clicked fired the callback).
Anchor destination thresold

The destination thresold parameter should be taken in consideration when we click on an anchor link.
split $tabbar-height into $tabbar-height and $tabbar-icon-width

by splitting tab bar height in height and icon-width (respectively for height and width settings related to the tab bar and tab bar sections), you can have wider icons/clickable areas in the tab bar, controllable via _settings.
$tabbar-icon-width defaults to $tabbar-height for a square icon

Signed-off-by: Maarten Ottens <m@maartenottens.com>

Conflicts:
	scss/foundation/components/_offcanvas.scss
Whoops overlooked mixin parameter while cherry-picking
hide inner radius
Merge pull request #5290 from pine3ree/patch-3

hide inner radius
Kitchen sink tweaks

Subheader presentation plus <dt>, <dl> and <dd> fixes.
Kitchen sink tweaks

Better describe dropdown button types
Kitchen sink tweaks

Tighten wording on panels.
Kitchen sink tweaks

Tighten wording on reveal.
Kitchen sink tweaks

Expanded labels on split buttons
Merge pull request #5323 from petecooper/master

Kitchen sink doc tweaks - no new functionality
Merge pull request #5279 from johnraz/SplitTabbarHeightAndWidth

Revival for #4086, split tab bar height and tab bar width
Merge pull request #5274 from glafarge/patch-4

Anchor destination thresold
Merge pull request #5215 from joelkinzel/joelkinzel-accordionToggleEvent

Accordion toggle event and callback tweak
Merge branch 'master' of github.com:zurb/foundation
Merge branch 'refs/heads/master' into 5.3-wip