Implemented task EXT-6559 (Appearance panel: Add edit button in place of the...

Implemented task EXT-6559 (Appearance panel: Add edit button in place of the image display next to current look).

- Changed the topmost part of the Appearance panel:
  * Added new "Edit current outfit" button.
  * Implemented COF status display (unsaved/wearing) according to the spec.
  * Minor XUI changes (font / dimensions / bg color).
- Removed the temporary "Edit current outfit" button from the bottom of the Appearance panel.
- Removed the temporary "ShowDebugAppearanceEditor" setting.

TODO: use icons from the spec (currently missing).

Reviewed by Nyx at https://codereview.productengine.com/secondlife/r/339/

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branch : product-engine