Fixed decimal for Scandinavian and similar Culture (#105)

Scandinavian and some other regions use Comma (,) instead of Period (.) for decimal places. This causes some issues when entering float values.

Author: zzzbatmand

ConfigurationManager.Shared/SettingFieldDrawer.cs

@@ -281,7 +281,7 @@ private static void DrawRangeField(SettingEntryBase setting)
             }
             else
             {
-                var strVal = value.ToString().AppendZeroIfFloat(setting.SettingType);
+                var strVal = Convert.ToString(value, CultureInfo.InvariantCulture).AppendZeroIfFloat(setting.SettingType);
                 var strResult = GUILayout.TextField(strVal, GUILayout.Width(50));
                 if (strResult != strVal)
                 {
@@ -314,7 +314,7 @@ private void DrawUnknownField(SettingEntryBase setting, int rightColumnWidth)
             {
                 // Fall back to slow/less reliable method
                 var rawValue = setting.Get();
-                var value = rawValue == null ? "NULL" : rawValue.ToString().AppendZeroIfFloat(setting.SettingType);
+                var value = rawValue == null ? "NULL" : Convert.ToString(rawValue, CultureInfo.InvariantCulture).AppendZeroIfFloat(setting.SettingType);
                 if (CanCovert(value, setting.SettingType))
                 {
                     var result = GUILayout.TextField(value, GUILayout.Width(rightColumnWidth), GUILayout.MaxWidth(rightColumnWidth));