* macOS 10.15 starts putting up permission dialogs we can't automatically
dismiss anymore, so start honoring the 'IncludeSystemPermissionTests' option
for macOS tests.
* Improve the 'IncludeSystemPermissionTests' option to have three states: if
set (either true or false), that takes precedence, but if not set, we now
don't run any tests that require permission dialogs on macOS or on device if
we're running in CI. Tests executed locally will still put up dialogs, both
on macOS and on device.
* This needed a few changes to the html report, since the
'IncludeSystemPermissionTests' is exposed in the UI and the code didn't
handle the three different states.
* Update a few tests to check for permission to the contacts.
Fixes https://github.com/xamarin/maccore/issues/1856.
121f04ce3d