Add a pile of FUI buttons

With the updated PNG library (1.6.8), we're getting stderr warnings about
non-conformance issues with images in the build.  These warnings include:

  * iCCP: known incorrect sRGB profile
  * iCCP: profile 'ICC Profile': 1000000h: invalid rendering intent
  * iCCP: cHRM chunk does not match sRGB

These were normalized by running an ImageMagick 'convert -strip' pass
over each PNG image.  'compare -metric AE' reports 0 delta for all
before/after pairs.

ACME-453, ACME-455, ACME-456, ACME-465 : Duplicate and tweak the Snapshot Profile UI to create the Snapshot Facebook UI

* Outbox updates now result in a resort to keep drag and drop items and folders properly sorted
* New icon for merchant outbox
* New behavior to accept drag and drop files over the entire merchant outbox floater

* Added Shop button to status bar
* Changed "Inventory..." menu item to go to same window as toolbar inventory button

EXP-1331 : Implement new longer caret and make it work on multi lines or columns of tools. EXP-1304 : handle only tools in DaD on toolbars

EXP-1300 : Implemented carets for DaD. Works with small bugs but OK for demo. Still in need of some cleanup