Draft: Update init of aiString (#5623)

* Draft: Update init of aiString

- closes https://github.com/assimp/assimp/issues/5622

* Update types.h

* Fix typo

* Fix another typo

* Adapt usage of AI_MAXLEN

* Fix compare operator

* Add missing renames

code/AssetLib/STL/STLLoader.cpp

@@ -257,7 +257,7 @@ void STLImporter::LoadASCIIFile(aiNode *root) {
         size_t temp = (size_t)(sz - szMe);
         // setup the name of the node
         if (temp) {
-            if (temp >= MAXLEN) {
+            if (temp >= AI_MAXLEN) {
                 throw DeadlyImportError("STL: Node name too long");
             }
             std::string name(szMe, temp);