Add configurable short wall/perimeter cleaning for Arachne (#2790)

* add feature to add configurable value to clean/remove short un-closed walls/perimeters, to improve print times and reduce stringing (and generally lead to a cleaner print).

* fixes to short wall removal, which no longer affects bottom or top surfaces. allowed adjusting Top-surface threshold (renamed from One wall threshold for clarity) when short wall removal value is configured above default of 0.5.

* small fix for toggle_line for min_width_top_surface, to only be visible if min_length_factor > 0.5 and arachne is enabled.

* Use copy of input_params

* revert `One wall threshold"` string change

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

src/libslic3r/PrintObject.cpp

@@ -1127,6 +1127,7 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "wall_transition_angle"
             || opt_key == "wall_distribution_count"
             || opt_key == "min_feature_size"
+            || opt_key == "min_length_factor"
             || opt_key == "min_bead_width") {
             steps.emplace_back(posSlice);
         } else if (