Move the new "default_new_layer_mode" APIs to the image...
...in both the core and libgimp. Images now know what the default mode for new layers is: - NORMAL for empty images - NORMAL for images with any non-legacy layer - NORMAL_LEGAVY for images with only legacy layers This changes behavior when layers are created from the UI, but *also* when created by plug-ins (yes there is a compat issue here): - Most (all?) single-layer file importers now create NORMAL layers - Screenshot, Webpage etc also create NORMAL layers Scripts that create images from scratch (logos etc) should not be affected because they usually have NORMAL_LEGACY hardcoded. 3rd party plug-ins and scripts will also behave old-style unless they get ported to gimp_image_get_default_new_layer_mode().
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