EmbLayer now an issue for Embroidermodder development, Text Storage and Rendering.

[robin-swift]

I'd tried to place EmbLayer reasoning in both ends, so it really needs to be sorted out in libembroidery on the grounds that SVG need layers and so full layer management is necessary: at least for the shapes part of the pattern.

Also, TextProperties and font management should be part of libembroidery for the purpose of generating text patches which is a major use of embroidery machines.