Make the increase of extruder motor current during MM filament

exchange sequences configurable.

src/libslic3r/PrintConfig.cpp

@@ -925,6 +925,15 @@ void PrintConfigDef::init_fff_params()
     def->mode = comExpert;
     def->default_value = new ConfigOptionEnum<GCodeFlavor>(gcfRepRap);
 
+    def = this->add("high_current_on_filament_swap", coBool);
+    def->label = L("High extruder current on filament swap");
+    def->tooltip = L("It may be beneficial to increase the extruder motor current during the filament exchange"
+                   " sequence to allow for rapid ramming feed rates and to overcome resistance when loading"
+                   " a filament with an ugly shaped tip.");
+    def->cli = "high-current-on-filament-swap!";
+    def->mode = comExpert;
+    def->default_value = new ConfigOptionBool(0);
+
     def = this->add("infill_acceleration", coFloat);
     def->label = L("Infill");
     def->tooltip = L("This is the acceleration your printer will use for infill. Set zero to disable "