Add wipe_tower_type printer setting to replace vendor-based wipe tower selection

Previously, wipe tower behavior was determined by checking if the printer
  was a QIDI vendor. This introduces a configurable enum (Type 1 / Type 2)
  so any printer can select its wipe tower implementation. BBL printers
  remain hardcoded to Type 1. Qidi profiles default to Type 1.

src/libslic3r/GCode.hpp

@@ -251,7 +251,7 @@ public:
     std::string     unretract() { return m_writer.unlift() + m_writer.unretract(); }
     std::string     set_extruder(unsigned int extruder_id, double print_z, bool by_object=false, int toolchange_temp_override = -1);
     bool is_BBL_Printer();
-    bool is_QIDI_Printer();
+    WipeTowerType wipe_tower_type();
 
     // SoftFever
     std::string set_object_info(Print* print);