* Ignoring setp_out sequence points when searching for sequence points that don't correspond to step_out requests.
* Not returning step_out sequence points when retrieving method debug  info.  The step out sequence points have the same offset as other sequence points, but different line numbers.
* Hardened the il2cpp_mono_free_method_signatures() function against multiple calls by setting the method_signatures hash table to null after it is cleared.
* The isActive field in Il2CppSequencePoint should be a uint8_t, not a bool, as it gets incremented.  I think this change was made in the previous C-only type for this struct but not propagated to the C++ version, which is the only version we use now.