Change over instances of "make" in the makefiles to "$(MAKE)" to allow for the make tool to be overridden.

Use puts_P() and printf_P() instead of the normal variants where possible in the Host mode Class Driver demos.

Remove outdated AVRStudio project files from demos, projects, bootloaders. Fix makefiles of ClassDriver device demos.

Seperated out OTG, Device and Host mode demos into seperate folders for clarity. Adjusted makefiles so that the path to the LUFA library can be set in one place.

Corrections to Keyboard demo.

Removed AVRISP_Programmer project due to code quality concerns.