user32: Add several more MsgWaitForMultipleObjects tests and split them out from the main message tests.

include: Add a definition for REGCLS_SURROGATE and add declarations for CoRegisterSurrogate and CoGetObjectContext.

Also make the conversions more strict against invalid input data.

Also some spelling fixes.

to pe_load_native_module (resp pe_load_builtin_module) to better describe
what those functions actually do.