funtion WM_keymap_add_item() now returns keymap-item, so you can use it
to set default properties for operators with WM_keymap_property_set().
Brecht will fill in this function, requires rna magic!
Example: an operator ED_OB_OT_add_primitive can be configured with
keymap like this:
WM_keymap_property_set(keymapitem, "Primitivetype", "Sphere");
Similar conventions we can use later for button/menu calls.
This will make creating operators easier, allowing a developer to group
tools functionality nicely.
f7106acde8