Rearranged the build  structure

Arranged structure and elements to cater for Linux makefiles later.

renamed:    sys/ReadMe.txt -> ReadMe.txt
renamed:    sys/include/FastDelegate.h -> include/FastDelegate.h
renamed:    sys/include/stdafx.h -> include/stdafx.h
renamed:    sys/targetver.h -> include/targetver.h
renamed:    sys/include/thread.h -> include/thread.h
renamed:    sys/posix/thread.cpp -> posix/thread.cpp
renamed:    sys/stdafx.cpp -> stdafx.cpp
renamed:    sys/sys.cpp -> sys.cpp
deleted:    sys.sln
deleted:    sys/sys.vcxproj
deleted:    sys/sys.vcxproj.filters
renamed:    sys/win32/thread.cpp -> win32/thread.cpp