EXP-1423 FIX FUI resets floater contents after closing them (Inventory Panel), this is inconsistant for previous sidebar users and introduces extra difficulty in productivity of the viewer.
EXP-1430 FIX Minimizing voice settings floater corrupts layout throughout rest of session

* Made the avatar pickers and destinations guide properly stack and position
  themselves.

Reviewed by Richard.

EXP-1433 FIX Speak button can be toggled while editing Input/Output devices when voice is deactivated

Reviewed by Merov.

EXP-1427 FIX Voice Settings dialog closes when selecting minimize option

floaters only stack on floaters that haven't moved

EXP-1424 FIX Floaters open on top of one another in default position with no offset
floaters now stack with their own kind preferentially

  would remove them from the surrounding toolbars.
* Removed dead drag & drop code
* Fixed issue where saving didn't necessarily work because toolbar populated
  with command id's that didn't have associated names.

EXP-1426 FIX Voice Settings floater button has label Nearby Voice and tool tip with label nearby voice

EXP-1412 FIX Additional Inventory windows are opened directly on top of each after opening additional inventory windows and closing the first time
also made sidepanel floaters reuse the existing instances, saving state

Reviewsed by Leslie

EXP-1353, EXP-1408, EXP-1410 : Fix bugs all related to Teleport History management. Note to dev: some use of boost trckable are being deprecated for thread safety so disconnect established connections in destructors. Also beware of singleton depending on each other as they are lazily instantiated.

EXP-1352 Red directional arrow shown on teleport screen when selecting a destination from the destinations floater to teleport to

Automated merge with bundle:c:\users\richard\appdata\local\temp\thg.7dtedl\ssh__richard@hg.lindenlab.com_paulgproductengine_exp-1386_ttxriq.hg