IDProperty python module update

- add support for IDProp array slicing, but not resizing.
- rename array attribute type to typecode and use chars 'f', 'd', 'i' which match pythons array module. (was using int's which only have a meaning internally).
- rename function 'convert_to_pyobject' to 'to_dict' and 'to_list' for IDProp group and array types respectively.
- remove 'len' array attribute, calling len(array) is fine.

release/scripts/modules/rna_prop_ui.py

@@ -111,12 +111,16 @@ def draw(layout, context, context_member, property_type, use_edit=True):
             continue
 
         row = layout.row()
-        convert_to_pyobject = getattr(val, "convert_to_pyobject", None)
+        to_dict = getattr(val, "to_dict", None)
+        to_list = getattr(val, "to_list", None)
 
         val_orig = val
-        if convert_to_pyobject:
-            val_draw = val = val.convert_to_pyobject()
-            val_draw = str(val_draw)
+        if to_dict:
+            val = to_dict()
+            val_draw = str(val)
+        elif to_list:
+            val = to_list()
+            val_draw = str(val)
         else:
             val_draw = val
 
@@ -131,7 +135,7 @@ def draw(layout, context, context_member, property_type, use_edit=True):
         row.label(text=key)
 
         # explicit exception for arrays
-        if convert_to_pyobject and not hasattr(val_orig, "len"):
+        if to_dict or to_list:
             row.label(text=val_draw)
         else:
             if key in rna_properties: