Also adds FATAL_ERROR guard when SOGEN_STATIC_CRT=ON without SOGEN_BUILD_STATIC=ON,
since static CRT with shared libraries causes heap corruption (each DLL gets its own
allocator but sogen passes ownership across boundaries).
These options are designed to be used together for full static linking, useful for
embedding sogen in projects like IDA Pro plugins.
the idea is to allow as much internal information into inner components.
to not burden all builds, the reflection level can be controlled
via the MOMO_REFLECTION_LEVEL (where 0 means no reflection code is
included).
more reflection variables will be introduced as needed.
for now, the memory manager's layout version is used to track whether
the memory layout is changed or not (at the lowest level).
the API consumer can use this to decide to refresh or not expensive
computations
