Add elegoo centauri carbon profile (#8405)

* Added Elegoolink connection

* Set Elegoo CC default bed to btPTE

* Friendly output of some error codes of PrintHost

* feat: Add elegoo centauri carbon profile

* fix: Fix the issue where the bed type in the printer configuration does not match the bed temperature settings when multiple bed types are not supported.

* feat: Modify the elegoo process parameters to disable slowdown_for_curled_perimeters.

* feat: Update comment to clarify plate visibility for multi bed support, BBL printer, and selected bed type.

* fix: Optimize ElegooLink upload; The code is clearer than before.

* feat: Format the ElegooPrintHostSendDialog code.

* fix: Remove the unnecessary instantiation attribute in the Elegoo process.

* fix: Flatpak compilation failed

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Co-authored-by: anjis <anjis.zhou@elegoo.com>

src/slic3r/Utils/Http.hpp

@@ -119,6 +119,7 @@ public:
 	// See also ca_file_supported().
 	Http& ca_file(const std::string &filename);
 
+	Http& form_clear();
 	// Add a HTTP multipart form field
 	Http& form_add(const std::string &name, const std::string &contents);
 	// Add a HTTP multipart form file data contents, `name` is the name of the part