SL-10325 FIXED Preferences tabs are displayed incorrectly if hovering it while searching any keyword

MAINT-4009: Patching the memory leak occurring in the scenario where avatar icon was being created, but the tab container did not have a button to accept the gieven icon.

MAINT-4009: Patching the LLTabContainer that was leaking some child views and their associated llimage allocations.

- Removed logging for MAINT-3555
- Added NULL guard to fix MAINT-3703 (hopefully)

- Removed a lot of logging code to reduce application close time

much cleanup of vector math
also made Stretch Both Sides checkbox clickable via label

- Added clear() after DeletePointer() call to hopfully fix this...

Cleaned up experience profile floater

replace llinfos, lldebugs, etc with new LL_INFOS(), LL_DEBUGS(), etc.

CHUI-807 : Add more defensive coding. Also trace in log the sessions created so we'll have a better idea of what people do with conversations if we see that crash again.

changed LLCriticalDamp to LLSmoothInterpolation and sped up interpolator lookup
improvements to stats display of llstatbar
added scene load stats floater accessed with ctrl|shift|2

CHUI 571: Code review changes, now LLFloaterIMContainer::showStub inlines code for hiding all tab panels and then showing the stub panel. Before the function would call hideAllTabs()

CHUI-571: Fixed bug where when the converation floater was torn off and a new im received, the incorrect conversation would be displayed and focused. In order to do this removed the conversation floater panels from being focused immediately when set visible. Also there was a bug when showing the stub panel for torn off conversations. The tab container was not setting the stub panel index properly to 0, which is where the stub panel existed in the tab container's list. This is post code review submit. Will submit another with minor code review changes.