Initial restructuring of the core USB driver module to support multiple architectures in the future.

Changed over www.fourwalledcubicle.com links to the new www.lufa-lib.org redirect domain, including the new aliased links for LUFA-related pages such as the various download/source control mirrors and support lists.

Add svn:eol-style property to source files, so that the line endings are correctly converted to the target system's native end of line style.

Add more include protection macros to give the user warnings when they try to manually include private driver header files, instead of the public driver headers.

Move StdRequestType.h, StreamCallbacks.h, USBMode.h from the LowLevel USB driver directory to the HighLevel USB driver directory, where they are more suited.