Add option to keep original sprite sizes. Close #107

- Enabled by default
- [GUI] Added "Keep original sprite sizes" option to the Export options
- [CLI] Added "--sprite-cropping" option to the Advanced section

AssetStudioGUI/Properties/Settings.Designer.cs

@@ -382,5 +382,17 @@ namespace AssetStudioGUI.Properties {
                 this["cachePath"] = value;
             }
         }
+        
+        [global::System.Configuration.UserScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.DefaultSettingValueAttribute("True")]
+        public bool keepSpriteSize {
+            get {
+                return ((bool)(this["keepSpriteSize"]));
+            }
+            set {
+                this["keepSpriteSize"] = value;
+            }
+        }
     }
 }