0.57.0

• Renamed ColorPlug child names to rgba rather than xyzw (issue #133).
• File->SaveAs... menu item now adds the file to the recent files list.
• Fixed unwanted vertical expansion of color plug widgets.
• Removed the unwanted visualisation of the “name” plug on shaders in the Node Graph.
• Added NodeGraph plugContextMenuSignal() and connectionContextMenuSignal() to allow customisable right click menus for plugs and connections (issue #122).
• RenderManShader annotations are now correctly reloaded when the shader itself is reloaded.
• RenderManShader UI produces more sensible errors when bad annotations are discovered.
• Fixed parameter ordering in RenderManShader UI (issue #136).
• Fixed bug which prevented numeric plug entry fields from showing the correct value when values outside the allowable range were entered.