Added new DNS::Resolve static method and organized it per OS.

include/ehs/io/socket/DNS.h

@@ -1,17 +1,9 @@
 #pragma once
 
-#include "ehs/EHS.h"
-#include "ehs/Str.h"
-#include "Socket.h"
+#include "ehs/system/OS.h"
 
-namespace ehs
-{
-    class DNS
-    {
-    public:
-		/// Resolves a hostname to an ip address.
-		/// @param [in] hostname The given hostname to resolve.
-		/// @returns The resulting ip address.
-        static Str_8 Resolve(const Str_8& hostname);
-    };
-}
+#if defined(EHS_OS_WINDOWS)
+	#include "DNS_W32.h"
+#elif defined(EHS_OS_LINUX)
+	#include "DNS_LNX.h"
+#endif