X2D Support (#13388)

# Description

Adresses #13294 

- Adds the X2D printer definition, machine presets, process presets,
filament presets, BBL profile index entries, CLI config entries,
filament blacklist updates, and printer/load/calibration/cover assets.
- Updates dual-nozzle handling to use configured toolhead labels and
match Bambu X2D hotend placeholders.
- Adds X2D-specific wipe tower cooling placeholder support and 3MF
filament/nozzle change sequence metadata import/export plumbing.

# Note

I own a P2S and an X2D. That's all. I frankly have no idea if my changes
cause regression on other printers, and have no capability to test. I
know that for my X2D, which runs an AMS, .2mm nozzles, SuperTack, and in
LAN mode, this has been working without issue.

# Screenshots/Recordings/Graphs

<img width="606" height="380" alt="Dual nozzle control"
src="https://github.com/user-attachments/assets/0d1c1063-4621-4097-b97c-d739557bf18c"
/>

*Dual nozzle control*

<img width="726" height="260" alt="image"
src="https://github.com/user-attachments/assets/270355b7-ca67-4ca3-ad19-582b8f11411b"
/>

*Multi nozzle filament override*

<img width="416" height="202" alt="X2D Machine config and dual nozzle
support"
src="https://github.com/user-attachments/assets/6a5c07b2-0d20-4819-8f42-d60731313249"
/>

*X2D Machine config and dual nozzle support*

<img width="397" height="142" alt="Filament for Supports test prints"
src="https://github.com/user-attachments/assets/3c7546bd-0e27-4d56-89b7-d9ca18c976f9"
/>

*Filament for Supports has been used in over 20 hours of test prints*

<img width="210" height="263" alt="Left vs Right filament distinction"
src="https://github.com/user-attachments/assets/03322268-b669-4f14-8d77-c4d96843d219"
/>

*Left vs Right filament distinction*

<img width="557" height="327" alt="Custom filament mapping"
src="https://github.com/user-attachments/assets/c1c4396f-7359-474e-80bd-78fec22f9c82"
/>

*Custom filament mapping*

<img width="556" height="314" alt="Auto map"
src="https://github.com/user-attachments/assets/d83e3217-edce-4340-886e-043962003a30"
/>

*Auto map*

<img width="689" height="664" alt="LAN mode send print with X2D preview
and no errors"
src="https://github.com/user-attachments/assets/76009bbf-31d3-4a6c-979c-8643b487c824"
/>

*LAN mode send print with X2D preview and no errors, dual nozzle
selection*


## Tests

- 20 hours of dual-nozzle printing.
- 100% CTest tests passed
- Validated 208 changed JSON files.

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Fix #13294

src/libslic3r/GCode/GCodeProcessor.hpp

@@ -251,6 +251,9 @@ class Print;
         std::vector<NozzleType> nozzle_type;
         // first key stores filaments, second keys stores the layer ranges(enclosed) that use the filaments
         std::unordered_map<std::vector<unsigned int>, std::vector<std::pair<int, int>>,FilamentSequenceHash> layer_filaments;
+        std::vector<unsigned int> nozzle_change_sequence;
+        std::vector<unsigned int> filament_change_sequence;
+        std::vector<int> optimal_assignment;
         // first key stores `from` filament, second keys stores the `to` filament
         std::map<std::pair<int,int>, int > filament_change_count_map;
 
@@ -288,6 +291,9 @@ class Print;
             limit_filament_maps = other.limit_filament_maps;
             filament_printable_reuslt = other.filament_printable_reuslt;
             layer_filaments = other.layer_filaments;
+            filament_change_sequence = other.filament_change_sequence;
+            nozzle_change_sequence = other.nozzle_change_sequence;
+            optimal_assignment = other.optimal_assignment;
             filament_change_count_map = other.filament_change_count_map;
             initial_layer_time = other.initial_layer_time;
 #if ENABLE_GCODE_VIEWER_STATISTICS