Extend Publish workflow with full-filament and type/color requirements

Per material slot, the Publish dialog can now embed the entire filament preset ("Full Publish") and require a curated filament type and/or colour:

- On export, full-publish vector options are masked to the author's slot so unrelated slot data never leaks into the published file.

- On load, slots are matched by the published type: a match keeps the receiver's material (full dumps ignored, partial keys applied); a mismatch replaces the slot with the first visible same-type library filament, falling back to a temporary embedded preset or skipped keys when none exists. Required colours apply regardless of the type match.

- The receiver's slot count grows only to the highest published slot.

- Published 3MFs load as a new project: the file's path is not adopted as the project filename, published metadata is stripped from the model, and the file is added to recent projects.

- Notifications list replaced slots, and the edited filament preset is refreshed so applied values surface in the GUI.

- Dialog: "Full Publish" toggle replaces the material opt-in and select-all headers; new Color/Type requirement rows with swatches.

- Add Ctrl+Shift+E shortcut for the Publish dialog (menu, key handling, and the keyboard shortcuts dialog).

- Tests for export slot masking, metadata round-trip, replacement semantics, slot growth, and skipped-key reporting.

src/slic3r/GUI/MainFrame.hpp

@@ -340,6 +340,8 @@ public:
     bool can_upload() const;
     void save_project();
     bool save_project_as(const wxString& filename = wxString());
+    // Open the Publish dialog and export the selected settings as a published 3MF.
+    void publish_project();
 
     void        add_to_recent_projects(const wxString& filename);
     void        get_recent_projects(boost::property_tree::wptree &tree, int images);