praxis.live.pxr - move code editing out of property editor and into BoundCodeProperty.
praxis.live.components - deprecate old palette API.
praxis.live.pxr - new layer based palette for PXR editors.
praxis.live.pxj - handle custom import statements, and various other layout fixes.
praxis.live.pxr.gui - switch to new palette API.
praxis.live.pxj - put back newline between class declaration and code now extra space is filtered out.