Added possibility for upload to Duet

Further changes:
- Added new configuration option Host Type
- Added abstract base class for future printer hosts
- Moved location of upload dialog (also made it a little bit more configureable)
- added possibility to send file via postfield instead a new frame

xs/src/slic3r/Utils/PrintHostFactory.hpp

@@ -0,0 +1,24 @@
+#ifndef slic3r_PrintHostFactory_hpp_
+#define slic3r_PrintHostFactory_hpp_
+
+#include <string>
+#include <wx/string.h>
+
+
+namespace Slic3r {
+
+class DynamicPrintConfig;
+class PrintHost;
+
+class PrintHostFactory
+{
+public:
+	PrintHostFactory() {};
+	~PrintHostFactory() {};
+	static PrintHost * get_print_host(DynamicPrintConfig *config);
+};
+
+
+}
+
+#endif