Simplified importer search and fixed a few bugs

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.

code/AssetLib/MS3D/MS3DLoader.cpp

@@ -88,26 +88,12 @@ MS3DImporter::MS3DImporter()
 // Destructor, private as well
 MS3DImporter::~MS3DImporter()
 {}
-
 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool MS3DImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
+bool MS3DImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool /*checkSig*/) const
 {
-    // first call - simple extension check
-    const std::string extension = GetExtension(pFile);
-    if (extension == "ms3d") {
-        return true;
-    }
-
-    // second call - check for magic identifiers
-    else if (!extension.length() || checkSig)   {
-        if (!pIOHandler) {
-            return true;
-        }
-        const char* tokens[] = {"MS3D000000"};
-        return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
-    }
-    return false;
+    static const char* tokens[] = { "MS3D000000" };
+    return SearchFileHeaderForToken(pIOHandler,pFile,tokens,std::size(tokens));
 }
 
 // ------------------------------------------------------------------------------------------------