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/STL/STLLoader.cpp

@@ -141,20 +141,9 @@ STLImporter::~STLImporter() {
 
 // ------------------------------------------------------------------------------------------------
 // Returns whether the class can handle the format of the given file.
-bool STLImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const {
-    const std::string extension = GetExtension(pFile);
-
-    if (extension == "stl") {
-        return true;
-    } else if (!extension.length() || checkSig) {
-        if (!pIOHandler) {
-            return true;
-        }
-        const char *tokens[] = { "STL", "solid" };
-        return SearchFileHeaderForToken(pIOHandler, pFile, tokens, 2);
-    }
-
-    return false;
+bool STLImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
+    static const char *tokens[] = { "STL", "solid" };
+    return SearchFileHeaderForToken(pIOHandler, pFile, tokens, std::size(tokens));
 }
 
 // ------------------------------------------------------------------------------------------------