FMod - Paste Planes

Once again I didn't get much time to tinker with Keen-related things, but I did continue making improvements in the style of yesterday's UI tweaks. Most notably, the Essential Manipulator's paste preview overlay now responds to changes in the plane states, just like that of the Paster. I also made its copy behavior match the normal Copier, copying all planes that aren't fully hidden.

Making the Essential Manipulator respond to plane state changes was surprisingly easy since it already had an event handler hooked up to the clipboard change notifier. Once I changed the Essential Manipulator's invocation of SetPastePreviewTiles to indicate that the preview plane should respect the plane states, the existing call to ClipNotify.Notify() in the StandardTools stop on the plane state change event bus was sufficient.