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/AppConfig.cpp

@@ -883,7 +883,7 @@ std::string AppConfig::load()
                 }
             }
         }
-    } catch(std::exception err) {
+    } catch(const std::exception &err) {
         BOOST_LOG_TRIVIAL(info) << format("parse app config \"%1%\", error: %2%", AppConfig::loading_path(), err.what());
 
         return err.what();