Support upload g-code to third-party printers

* wip

* fix cmake warning

* add UI and config options for Moonraker connection

* wip: copy whole print host UI from PS

* add more needed options

* wip 2

* fix string issue on Mac

* wip3

* fix cmake warning

* working
need tweaks

* cleanup

* support thumbnail

* fix DNS resolving issue in Windows

* code clean up

src/libslic3r/PresetBundle.cpp

@@ -1245,8 +1245,10 @@ DynamicPrintConfig PresetBundle::full_config() const
 DynamicPrintConfig PresetBundle::full_config_secure() const
 {
     DynamicPrintConfig config = this->full_config();
-    //BBS example: config.erase("print_host");
-    return config;
+    //FIXME legacy, the keys should not be there after conversion to a Physical Printer profile.
+    config.erase("print_host");
+    config.erase("printhost_apikey");
+    config.erase("printhost_cafile");    return config;
 }
 
 const std::set<std::string> ignore_settings_list ={
@@ -3231,4 +3233,4 @@ void PresetBundle::set_default_suppressed(bool default_suppressed)
     printers.set_default_suppressed(default_suppressed);
 }
 
-} // namespace Slic3r
+} // namespace Slic3r