patch by thickbrick sleaford, reviewed by me (tofu linden)

DEV-44637 'debug gl', 'debug pipeline', 'fast alpha', 'animate textures' menu options all toggle at the same time, do not correspond to the correct underlying prefs

For EXT-3622: Take off item, wear a different item --> first item is put on again.  Fixed the 'remove all clothing' case.

fix bug, also fix some comments/typos/enumparams in this code area.

These IDs are sent as the following query parameters to the search
server: sid=, rid=, pid=, for the Session ID, Region ID, and Parcel ID
respectively.

For some reason, Parcel ID always seems to be NULL though. I'll file a
separate JIRA for that.

Add LLEventDispatcher::getDispatchKey() to retrieve a previously-
inaccessible value.

No code changed

Related to EXT-3628("Connecting to.." popup appears behind voice control panel while calling): Added workaround which sets current call dialog to front most.

--HG--
branch : product-engine

--HG--
branch : product-engine

added sidetray tab buttons panel to transient manager control list,
added right padding to the docking rect area to avoid overlapping docked IM
floaters with sidetray buttons;

--HG--
branch : product-engine

--HG--
branch : product-engine

Work on normal bug EXT-3434 	There is no difference between invited and left participants in a Group call (Voice Controls)
-- implemented workaround not to set agent in HAS LEFT state

--HG--
branch : product-engine

Work on normal bug EXT-3434 	There is no difference between invited and left participants in a Group call (Voice Controls)
-- commented out updating participants voice states from draw()
-- improved removing of HAS LEFT participant (now it is removed via LLAvatarList approach instead of LLFlatListView)

--HG--
branch : product-engine

Work on normal bug EXT-3434 	There is no difference between invited and left participants in a Group call (Voice Controls)
-- implemented removing of participant who has left voice chat from the list (after hardcoded 10 seconds)
-- added struct params to be set from the xml

--HG--
branch : product-engine

Work on normal bug EXT-3434 	There is no difference between invited and left participants in a Group call (Voice Controls)
-- added doxygen comments in header
-- replaced collecting of voice participants' uuids, added helpful & removed unused code comments in cpp

--HG--
branch : product-engine

--HG--
branch : product-engine

--HG--
branch : product-engine

--HG--
branch : product-engine

--HG--
branch : product-engine

--HG--
branch : product-engine