Improve error reporting: Extract original message when showing "Java exception messages" consistently. Improve error handling in deprecated OneDrive API stub and avoid crash by no-longer throwing in Main-thread methods.

src/keepass2android-app/ShareUrlResults.cs

@@ -121,7 +121,7 @@ namespace keepass2android
                 
             } catch (Exception e)
 			{
-				App.Kp2a.ShowMessage(this, e.Message,  MessageSeverity.Error);
+				App.Kp2a.ShowMessage(this, Util.GetErrorMessage(e),  MessageSeverity.Error);
 				SetResult(Result.Canceled);
 				Finish();
 				return;