Add UNLOAD_FILAMENT_AFTER_PRINT macro

[HitLuca]

I was thinking about an interesting addition for this project, a macro to call UNLOAD_FILAMENT after the print is finished. Would this be feasible? I'm on an old-ish version of this project, so apologies if it has already been implemented. Let me know!

[stablestud]

You can add UNLOAD_FILAMENT to the end gcode macro in your slicer