Added delta configuration for BeBoPr++ with PEPPER.
Ignore device tree overlay binaries (*.dtbo).
Added delta configuration for BeBoPr++ with on-board stepper drivers.
Added device tree overlays for BeBoPr++ boards and added these to the compilation script.
Setup.bridge can now handle a disabled overlay and tries to load the best available one.
Merge pull request #238 from modmaker/feature/configs

BeBoPr++ new configurations and pepper driver update.