* Refactor for AMJ Pad
* Configurator update for AMJ Pad
* Add hardware agnostic layouts numpad_6x4 and ortho_6x4
* Add agnostic layouts to rules.mk
* Refactor AMJ Pad to use new hardware agnostic layouts
Using only one layer, and activating it with two keys at the moment.
As with previous comments, this isn't final, but is a good starting point for a one-handed keyboard, half a Planck-like ortholinear keyboard, or a sample to show a layout with a function layer.