Support base SDXL and SDXL refiner models.

Large refactor of the model detection and loading code.

nodes.py

@@ -48,7 +48,9 @@ class CLIPTextEncode:
     CATEGORY = "conditioning"
 
     def encode(self, clip, text):
-        return ([[clip.encode(text), {}]], )
+        tokens = clip.tokenize(text)
+        cond, pooled = clip.encode_from_tokens(tokens, return_pooled=True)
+        return ([[cond, {"pooled_output": pooled}]], )
 
 class ConditioningCombine:
     @classmethod
@@ -1344,7 +1346,7 @@ NODE_CLASS_MAPPINGS = {
     "DiffusersLoader": DiffusersLoader,
 
     "LoadLatent": LoadLatent,
-    "SaveLatent": SaveLatent
+    "SaveLatent": SaveLatent,
 }
 
 NODE_DISPLAY_NAME_MAPPINGS = {