EXT-2260 FIXED Changed camera floater according to new style

- Implemented new widget- panel_camera_item, to use in camera floater. They are used inside of two panels.
Their order is configurable via XML. Mouse down callbacks and images which are used for selected and and unselected
items are also set in XML.
- Now there are only 3 buttons instead of four at the bottom of the floater- pan and orbit are now shown simultaneously.
- Implemented correct work of object view after moving from camera modes to presets list (and back). It wasn't
workin completely correct in old version of floater.
- Integrated new art.

Reviewed by Igor Borovkov at https://codereview.productengine.com/secondlife/r/436/

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branch : product-engine