Enhancement: Do not slow down external perimeters to meet minimum layer time (#5148)

* POC - Do not slow down external perimeters to meet minimum layer time

* POC - Do not slow down external perimeters to meet minimum layer time - rework

* Revert "POC - Do not slow down external perimeters to meet minimum layer time"

This reverts commit d84ff93f901c6773c246926f6fd34f22e14b7131.

* Dont slow down external perimeters to meet layer time target v2

* Reverted previous implementation

* UI fixes for dont slow down for layer cooling

* Update dont slow down outer walls naming convention

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Co-authored-by: SoftFever <softfeverever@gmail.com>

src/libslic3r/PrintConfig.cpp

@@ -1700,6 +1700,15 @@ void PrintConfigDef::init_fff_params()
     def->tooltip = L("If enable this setting, part cooling fan will never be stoped and will run at least "
                      "at minimum speed to reduce the frequency of starting and stoping");
     def->set_default_value(new ConfigOptionBools { false });
+    
+    def = this->add("dont_slow_down_outer_wall", coBools);
+    def->label = L("Don't slow down outer walls");
+    def->tooltip = L("If enabled, this setting will ensure external perimeters are not slowed down to meet the minimum layer time. "
+                     "This is particularly helpful in the below scenarios:\n\n "
+                     "1. To avoid changes in shine when printing glossy filaments \n"
+                     "2. To avoid changes in external wall speed which may create slight wall artefacts that appear like z banding \n"
+                     "3. To avoid printing at speeds which cause VFAs (fine artefacts) on the external walls\n\n");
+    def->set_default_value(new ConfigOptionBools { false });
 
     def = this->add("fan_cooling_layer_time", coFloats);
     def->label = L("Layer time");