Primary changes are to include/assimp/metadata.h, adding in the aiMetadata GetAiType function,
adding the operator= to allow an aiMetadata type to be assigned, adding a check for the
AI_AIMETADATA type flag as it can't be trivially memcpy'd.
operator= is implemented with a by-value argument as then the copy is made by the copy
constructor and we can just swap everything out and let the destructor handle the mess.
Implemented parsing of the "extensions" flag on all glTF2 Nodes. Doesn't use the ReadValue
helper function on numbers as it did not seem to fill out the Nullable structure properly.
Yingying Wang
Evangel
Kim Kulling
Alec
kimkulling