We had some kernel-specific gizmos in AK that should really just be in the Kernel subdirectory instead. The only thing remaining after moving those was mmx_memcpy() which I moved to the ARCH(i386)-specific section of LibC/string.cpp.
We don't actually do any non-i386 builds at the moment, this is just gently steering in a nice direction for the future. :^)
Things were getting a little crowded in the project root, so this patch moves the Lib*/ directories into Libraries/.
