* clutter/clutter-private.h: Move clutter_feature_init()
declaration here: you shouldn't even need to initialise
features yourself.
* clutter/clutter-feature.c: call clutter_feature_init()
each time you try to access the feature list; add a static
lock around the feature flags container; add api documentation.
* clutter/clutter-feature.h: Add a type for the feature flags
to make bindings happy.
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