Approximately three or four times now, the issue of pointers being
in an inconsistent state been an issue in the video backend renderers
with regards to tripping up other developers.
Global (ugh) resources are put into a unique_ptr and will always have a
well-defined state of being - null or not null
This removes OSD support for video software, but it was already broken before.
This commit does not try to fix coding style issues, the rewrite of this presentation API is splitted up.
Pierre Bourdon