Bug 769738 - Add color tags/labels for layers/channels/paths
Add property "color-tag" of type enum GimpColorTag to GimpItem so all layers, channels and paths can be tagged with a color. For interoperability, use the color list from Krita which is a superset of Photoshop's colors. Features a "Color Tag" submenu in the layers, channels and paths menus, a row of color radio buttons in the properties dialogs, undo and PDB API. As a side effect, some common code is now factores out into items-actions.[ch] and items-commands.[ch] which adds visible, linked and lock actions for layers and channels.
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