texture: Clean up error reporting
ClutterTexture relies too much on GError, even for things that are clearly programmer errors. Also, no error message passed to GError is marked for translation as it should. We should move the programmer errors, like passing the wrong bpp value with regards to the presence of the alpha channel, to real warnings; we should also try and harmonize all the error messages, and not mention Cogl — especially in the ones marked for translation.
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