+ add FlashAir support for host upload

src/slic3r/Utils/PrintHost.cpp

@@ -14,6 +14,7 @@
 #include "libslic3r/Channel.hpp"
 #include "OctoPrint.hpp"
 #include "Duet.hpp"
+#include "FlashAir.hpp"
 #include "../GUI/PrintHostDialogs.hpp"
 
 namespace fs = boost::filesystem;
@@ -43,6 +44,7 @@ PrintHost* PrintHost::get_print_host(DynamicPrintConfig *config)
         switch (host_type) {
             case htOctoPrint: return new OctoPrint(config);
             case htDuet:      return new Duet(config);
+            case htFlashAir:  return new FlashAir(config);
             default:          return nullptr;
         }
     } else {