Update/cleanup Makefiles (#265)

- add new target "make mfkey" to build mfkey32 and mfkey64
- include above when "make all"
- fix Qt detection for Kali Linux
- create and use dependency files when building client
- create client/lualibs/usb_cmd.lua from include/usb_cmd.h when building client
- add Windows *.exe files with "make tarbin"
- For the time being don't include Makefile.common in Makefile and client/Makefile
- set com3 as default flashing port for Windows (including mingw)
- remove static targets snooper and cli. Remove their sources as well.

client/guidummy.cpp

@@ -0,0 +1,27 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2009 Michael Gernoth <michael at gernoth.net>
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// GUI dummy file
+//-----------------------------------------------------------------------------
+
+#include <stdio.h>
+
+extern "C" void ShowGraphWindow(void)
+{
+	static int warned = 0;
+
+	if (!warned) {
+		printf("No GUI in this build!\n");
+		warned = 1;
+	}
+}
+
+extern "C" void HideGraphWindow(void) {}
+extern "C" void RepaintGraphWindow(void) {}
+extern "C" void MainGraphics() {}
+extern "C" void InitGraphics(int argc, char **argv) {}
+extern "C" void ExitGraphics(void) {}