Fixes 2 Bugs and 13 Compiler Warnings (#10670)

* fixes: %g directive writing between 1 and 13 bytes into a region of size between 6 and 18 [-Wformat-overflow=]

* fixes: %5s directive writing between 5 and 63 bytes into a region of size 58 [-Wformat-overflow=]

* fixes: catching polymorphic type by value [-Wcatch-value=]

* fixes: [-Wcomment]; removes whitespaces

* increases buffer size from 71B to 90B to avoid potential ovfl.

src/libslic3r/Format/STEP.cpp

@@ -712,7 +712,7 @@ unsigned int Step::get_triangle_num(double linear_deflection, double angle_defle
                 return 0;
             }
         }
-    } catch(Exception e) {
+    } catch(const Exception &e) {
         return 0;
     }