Octoprint (#796)

* Octoprint: GUI for CA file, improvements

* Octoprint: Add GUI for Bonjour lookup, bugfixes

* Octoprint: Bonjour browser: Cleanup Perl interaction

* Octoprint: Bonjour: Perform several broadcast, UI fixes

* Octoprint: Add files to localization list

* Http: Disable CA File setting on SSL backends that don't support it

xs/src/slic3r/Utils/Http.hpp

@@ -41,6 +41,7 @@ public:
 	Ptr perform();
 	void perform_sync();
 
+	static bool ca_file_supported();
 private:
 	Http(const std::string &url);