Contribution by Beq Janus

Signal handling is ugly, but so far that's the only option that works

Approved-by: Maxim Nikolenko <maximnproductengine@lindenlab.com>
Approved-by: Andrey Lihatskiy <andreylproductengine@lindenlab.com>

xcode 12.3 buildfix

* xcode 12.3 buildfix

Approved-by: Andrey Kleshchev

Due to crash inside uriparser's code

Session was deleted before viewer had a chance to create view for listener, so listener ended up not deleted and avaiting an uptade, then tryed to call for deleted session.

Models (listeners) belong to folder-views, deleting all of them means that not only proper cleanup procedure won't be followed, and view might try clean dead pointer.

Vivox was using dead pump

Switch Intel HD4000 and HD2500 off of forced 32-bit

SL-13161 Leftover change

* SL-13161 Leftover change

Approved-by: Andrey Kleshchev

# Conflicts:
#	indra/newview/llfloatereditextdaycycle.cpp
#	indra/newview/llfloaterfixedenvironment.cpp

following promotion of DRTVWR-507

In scope of SL-13740 work, this reverts commit 1935d25c.

LLHUDObject has a lot of deriveds stored as LLPointer<LLHUDObject>, no-virtual destructor is unlikely to be cause of the crash, but might be related