Maxon’s Melange SDK has been renamed Cineware SDK as of 21.004, and with it all namespaces and types. This commit
- makes CMake use contrib/Cineware instead of contrib/Melange;
- renames Assimp’s namespace melange to namespace cineware;
- removes useless functions and formatter references from class C4DImporter;
- removes duplicate conversion of cineware::String to aiString in the importer;
- updates comments accordingly;
- updates copyright info.
The search for a matching importer had a few issues, see #3791. There were two different mechanisms to determine whether an importer accepts a specific file extension:
1. `aiImporterDesc::mFileExtensions`, which was forwarded to the UI via `BaseImporter::GetExtensionList()`.
2. `BaseImporter::CanRead()` when called with `checkSig == false`, which determines whether to actually use that importer.
Both were redundant and got out of sync repeatedly. I removed 2. completely and replaced it with 1., thereby syncing UI/import and shortening all `BaseImporter::CanRead()` implementations.
Further bugfixes:
- fixed glTF2 importer throwing exceptions when checking whether it can load a file
- removed `BaseImporter::SimpleExtensionCheck()` because it is no longer used and had a bug with case sensitivity
Since the `checkSig` parameter in `BaseImporter::CanRead()` is now useless, it can be removed completely. I’m not sure if this would break ABI compatiblity, so I’ll submit it with a later pull request.