create_mesh, create_dupli_list, make_display_list and is_visible.
This is done in order to make these context independent as the RNA API should
be as much as possible, and to fix#21297 and #21719, where there was an
assumption from these functions that there is a scene in the context, which
does not work for external render engines exporting in a separate thread.
Also avoided using context in a number of other functions, ideally only UI/WM
type functions should use context.
I've updated the scripts in trunk, but the addons and external ones in
development will need updates too.
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