In sandbox_vs.cpp, there is a very strange issue with calling
traits::is_input_serializable that causes icc 15.0.0 to crash.
Everything else works great though.
Added a set of trait classes that can be used to get an input archive
from an output archive. Requires specializing a struct for each direction or
alternatively using the new macro CEREAL_SETUP_ARCHIVE_TRAITS(InArchive, OutArchive).
This has already been added for all built in archive types. This is currently only
used for minimal serialization.
load_minimal type traits now correctly use the output archive to check the existence of
a corresponding save_minimal and get its return type, using the new get_input_from_output
type class.
Added a test for this case into the minimal structs test.
Sandbox_vs needed the new macro to become compliant.
