Simple perpetual loading indicator a la MacOS X or YouTube.
Implements spinning by changing pre-defined images.
The images are hardcoded, shared by all instances of the widget.
Number of rotations per second can be changed via params.

Reviewed by Mike at https://codereview.productengine.com/secondlife/r/320/

--HG--
branch : product-engine

Merge inspectors UI project, gooey-4, into viewer-2 trunk.  Added new tooltips to 3D avatars, 2D avatar names, and 3D objects.  Refactors tooltips and text boxes, line editors, and text editors.  Breaks LLExpandableTextBox, but a fix is coming.

Resolved conflicts in lltexteditor.cpp, llchatitemscontainerctrl.cpp, llchatmsgbox.cpp, llfloaterbuycurrency.cpp, llnearbychat.cpp, floater_buy_currency.xml, and ru/strings.xml

Merging revisions 134925-135157 of svn+ssh://svn.lindenlab.com/svn/linden/branches/gooey/gooey-4 into C:\source\viewer-2.0.0-3, respecting ancestry

Merging revisions 127913-128319 of svn+ssh://svn.lindenlab.com/svn/linden/branches/skinning/skinning-17 into D:\viewer-2.0.0-3, respecting ancestry

Merge skinning-14 to viewer-2, including refactoring many floaters to register them with LLFloaterReg, support for introspection of ParamBlock based UI widgets to dump XML schema, splitting llfolderview.cpp into three separate files to unravel dependencies and skeleton for for LLListView widget.  Resolved conflicts in these files:
lldraghandle.h, lluictrl.h, llchiclet.cpp, llfolderview.h/cpp, lliinventorybridge.cpp, llpanelpicks.cpp, llviewermenu.cpp, floater_mute.xml, floater_preferences.xml, notifications.xml, panel_preferences_audio.xml, panel_preferences_graphics1.xml, panel_region_general.xml
svn merge -r124961:126284 svn+ssh://svn.lindenlab.com/svn/linden/branches/skinning/skinning-14

ignore-dead-branch