sanitize slot name before registering it

this avoids a slot being added multiple times if sanitization results in the same name which would break (e.g. "roof" and "roof_")

Author: marwie

src/utils/parser.js

@@ -25,7 +25,10 @@ function parse(gltf, { fileName = 'model', ...options } = {}) {
     const slot = child.userData?.prop;
     const hasSlot = (slot && typeof slot === "string" && slot.length > 0);
     if (hasSlot)
-      slots[slot] ? slots[slot].push(child) : (slots[slot] = [child]);
+    {
+      const slotname = sanitizeSlotName(slot);
+      slots[slotname] ? slots[slotname].push(child) : (slots[slotname] = [child]);
+    }
   })
 
   // Browse for duplicates
@@ -465,7 +468,7 @@ function parse(gltf, { fileName = 'model', ...options } = {}) {
     console.log('Error while parsing glTF', e)
   }
 
-  const slotParams = Object.keys(slots).length > 0 ? (Object.keys(slots).map(sanitizeSlotName).join(", ") + ", ") : "";
+  const slotParams = Object.keys(slots).length > 0 ? (Object.keys(slots).join(", ") + ", ") : "";
 
   const header = `/*
 ${options.header ? options.header : 'Auto-generated by: https://github.com/pmndrs/gltfjsx'} ${