* Has a couple of limitations - won't check deferred context or
NO_OVERWRITE Map()s except in a captured frame. This could in theory be
implemented but it'd be complex and I don't want to complicate/break
the normal path.
* When an overrun is detected, a messagebox pops up to block the thread,
and if you hit yes, it will debugbreak.
* These capture options used to be propagated through from the C++ struct
when there was a C++/CLI dll used for interop between C# and C++. Now
that we use P/Invoke this needs to be added back so a couple of default
options can be enabled
baldurk