#13 Adjust to 3.32 changes
Merged by fmuellner. Opened by fmuellner.

There have been several changes to the StTextureCache API that need adjustments, namely:
- fractional scaling support requires an additional resource-scale parameter
- the returned actor is no longer a ClutterTexture, but an actor with an appropriate StImageContent

Pull-Request has been merged by fmuellner

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