Update ModuleTest to compile for each sub-family within each architecture, to ensure that the code compiles for all devices (not just for one device in each architecture).

Update StaticAnalysisTest to check for missing header files. Fix found incorrect header file paths in the demos and projects.

Enable -Wcast-align warning for the UC3 architecture in the ModuleTest build test now that the test passes with it.

Minor documentation improvements.

Update ModuleTest build test to use as many compile warnings as possible. Set -Werror so that any generated warnings produce an error.

Update build test "ModuleTest" to check platform drivers where possible. Add missing copyright/license headers.

Fix UC3 Interrupt Management platform driver not compiling under C++.

Add build tests to verify correct compilation of as many modules as possible under as many architectures as possible.

Fix broken compilation of LUFA under C++ compilers when the Serial peripheral module header file is included in a C++ source file.

Fix missing semicolon in the UC3 architecture host pipe functions.

Fix failed compilation for the XMEGA architecture if USB_DEVICE_ONLY us not specified.