This avoids issues with Catch2's handler firing too early, on
structured exceptions that would be handled later. This issue
meant that the old attempts at structured exception handling
were incompatible with Windows's ASan, because it throws
continuable `C0000005` exception, which it then handles.

With the new handling, Catch2 is only notified if nothing else,
including the debugger, has handled the exception.

Signed-off-by: Alan Jowett <alanjo@microsoft.com>

Closes #2332
Closes #2286
Closes #898

This should provide the same overall stdout/err, but the new
output should feel "faster" for test cases that are entered
and exited multiple times (e.g. due to generators).

* Call order of listeners/reporters in multireporter
* Adding listeners/reporters properly updates reporter preferences

This requires a bunch of different changes across the reporter
subsystem.

* We need to handle multiple reporters and their differing
  preferences in `ListeningReporter`, e.g. what to do when
  we mix reporters that capture and don't capture stdout.
* We need to change how the reporter is given output and
  how we parse reporter's output destination from CLI.
* Approval tests need to handle multireporter option