Moved CPrimaryScreen and CSecondaryScreen to the lib/synergy

and the platform specific implementations to lib/platform.
Added an lib/arch method to query the platform's native wide
character encoding and changed CUnicode to use it.  All
platform dependent code is now in lib/arch, lib/platform,
and the programs under cmd.  Also added more documentation.

lib/arch/CArchDaemonUnix.h

@@ -20,6 +20,7 @@
 #undef ARCH_DAEMON
 #define ARCH_DAEMON CArchDaemonUnix
 
+//! Unix implementation of IArchDaemon
 class CArchDaemonUnix : public CArchDaemonNone {
 public:
 	CArchDaemonUnix();