Added code to properly escape non-ascii characters in URLs passed to the WebBrowserComponent on macOS/iOS

modules/juce_gui_extra/native/juce_mac_WebBrowserComponent.mm

@@ -231,8 +231,15 @@ public:
         }
         else
         {
+            NSString* urlString = juceStringToNS (url);
+
+           #if (JUCE_MAC && (defined (__MAC_OS_X_VERSION_MIN_REQUIRED) && defined (__MAC_10_9) && __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_9)) || (JUCE_IOS && (defined (__IPHONE_OS_VERSION_MIN_REQUIRED) && defined (__IPHONE_7_0) && __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_7_0))
+            urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
+           #else
+            urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
+           #endif
             NSMutableURLRequest* r
-                = [NSMutableURLRequest requestWithURL: [NSURL URLWithString: juceStringToNS (url)]
+                = [NSMutableURLRequest requestWithURL: [NSURL URLWithString: urlString]
                                           cachePolicy: NSURLRequestUseProtocolCachePolicy
                                       timeoutInterval: 30.0];