Crash dumps are broken on Windows

[marcusbirkin]

Breakpad isn't running the callback dumper for the Windows build, unsure from when but with at least v2.2.0-beta.1
From testing this appears to be only for Qt GUI apps; console apps work ok

Testing in release code is hampered by crash_test in v2.2.0-beta.1 not having suitable Qt6 callbacks as QSignalMapper::mapped was deprecated

sacnview/src/ui/crash_test.cpp

Line 23 in bbe9ac0

connect(m_signalMapper, SIGNAL(mapped(int)),

Updated for Qt6

sacnview/src/ui/crash_test.cpp

Line 23 in 107b863

connect(m_signalMapper, SIGNAL(mappedInt(int)),

[marcusbirkin]

Qt GUI is handling and absorbing all the normally "Unhandled" exceptions, meaning that the callback to create the minidumps from SetUnhandledExceptionFilter is never called.

Callbacks from AddVectoredExceptionHandler work, however this returns on all exceptions including those in a try-block.
Breakpad does not include, out the box, support for vectored exception handler anyway.

I'm not sure how to resolve this one....