Integration of the "cereal" serialization library.
Serialization / deserialization of the DynamicConfig / DynamicPrintConfig.
DynamicPrintConfig serializes ordinal identifiers instead
of the option key strings to conserve space.
they are presented in the UI.
Parallelized the slice stealing when splitting regions with modifier meshes.
Rewrote Layer::make_perimeters() to C++11 loops.