Extend bootloader build test to include all supported configurations including the special XPLAIN board configuration and possible F_USB values.

Add DEBUG_FORMAT and DEBUG_LEVEL optional parameters to the BUILD module. Turn off generation of debug information when performing a validation build, and when running the build tests.

Rename build system module makefiles from "lufa.MODULE.in" to "lufa_MODULE.mk" to prevent makefile from assuming the include is an old style build rule, slowing down the build process.

Prevent the BUILD module from shell-executing multiple processes to determine the avr-size flags to speed up the build, unless the size rule is invoked.

Add warnings and set warnings as errors to the SingleUSBModeTest build test makefile.

Mark build test makefiles as being incompatible with parallel make builds, as they re-use the same object directories.

Switch StaticAnalysisTest build test to use the new build system CPPCHECK module. Update additional build tests to all include the core build system module.

Ensure build tests use the system provided $(MAKE) variable to determine the command to invoke make, rather than a hard-coded name. Strip off excess whitespace from the list of object files when printing them out to the shell in the build system BUILD module.

Replace architecture specific makefiles in the BuildTests with the new common build system makefiles.

Add missing documentation to custom BuiltTest hardware mapping files. Fix up old copyright years on some makefiles.

Clean up and speed up build tests by turning off expensive and slow size optimizations, and generation of assembly listings (*.lst) for each compiled source file.

Fixed compile error with the unreleased ATMEGA32U6 device.