EXP-1479 FIX Chat history does not open when selecting toggle on chat floater and issue with minimizing and opening chat floater

EXP-1458 FIX Chat text entry bar does not have focus when chat floater is opened while chat history is toggled open

EXP-1461 FIX Incoming Nearby chat not visible in chat toasts/bubbles to user when chat window is minimized with chat history opened
made minimizing and unminimizing nearby chat floater do the right thing

EXP-1461 FIX Incoming Nearby chat not visible in chat toasts/bubbles to user when chat window is minimized with chat history opened

EXP-1417 FIXED (Docked Notifications window tears off from the dock icon when deleting notifications one by one)

- Changed LLSysWellWindow::reshapeWindow() so that the floater decreases from bottom to top, without changing top coordinate.

- Force dock control repositioning in case floater rect changed.

EXP-1469 FIX -- Changing toolbar from "icons only" to "icons with text" while incoming/outgoing call floater is open causes crash on mac

* Updated LLToolBar to call remove and add on all buttons when rebuilding the toolbar.

EXP-1398 FIX -- Viewer Crash when moving Speak button from bottom toolbar to side toolbar with call request dialog active on Mac

* Added "on button removed" callback for toolbars.
* Changed docking on incoming and outgoing call floaters to be undocked when "speak" button removed.

Reviewed by Leyla.

made sessionsettings pref not persistent

Adding back code that was accidentally removed in changeset ff333a95d1aa.

EXP-1460 : Make the caret in favorites toolbar display more consistently and with less finicky hit testing

EXP-1462 FIX -- Moving speak button or voice settings button between toolbars can cause viewer to crash on Mac

* Updated iterator code to not erase stuff while we're iterating through it!

Reviewed by Richard.

  "DisplayDestinationsOnInitialRun" setting or initial agent SL login.
* Added toolbar enumeration for toolbar view so queries for commands can now
  indicate where the command currently is on the left, right or bottom toolbars.
* Updated toybox toolbar button tooltips to indicate where the command currently
  resides in the view.
* Added unused function to allow toolbar buttons to be changed to flash
  indefinitely.

Reviewed by Richard.

* All text updated to read "Toolbar buttons" in the appropriate ways.

* L$ background color now matches the menu bar.  The tooltip and click behavior
  have been left untouched, per design.