more ui api changes.

- remove functions such as operator_int(), operator_enum(), operator_string
  this mixed with keyword arguments in a way that made them hard to read.
  Instead, have operator() always return properties rather then needing an argument.

- rename prop_pointer() --> prop_object(), pointer is more a C thing.

- missed item_enumR(), rename to prop_enum()

release/scripts/ui/properties_render.py

@@ -57,7 +57,7 @@ class RENDER_PT_render(RenderButtonsPanel):
 
         if wide_ui:
             col = split.column()
-        col.operator_boolean("screen.render", "animation", True, text="Animation", icon='ICON_RENDER_ANIMATION')
+        col.operator("screen.render", text="Animation", icon='ICON_RENDER_ANIMATION').animation = True
 
         layout.prop(rd, "display_mode", text="Display")