Fix float number not working properly for option min/max (#11211)

* ConfigOptionDef: min/max values type are changed from INT to FLOAT.

(cherry picked from commit f277bc80c22e0c9a067481a4301922e2c96aed47)

* Fix infinite loop and crash when `fuzzy_skin_point_distance` = 0 (SoftFever/OrcaSlicer#11069)

* Fix Linux build issue

* Fix float comparison due to precision loss

src/slic3r/GUI/Widgets/SpinInput.hpp

@@ -78,6 +78,9 @@ public:
 
     void SetRange(int min, int max);
 
+    int GetMin() const { return this->min; }
+    int GetMax() const { return this->max; }
+
 protected:
     void DoSetToolTipText(wxString const &tip) override;