Add support for remote context capture and replay, including Android

* Still missing is remote file/folder browsing, and managing remote
  hosts adding/removing etc.

qrenderdoc/Windows/DebugMessageView.cpp

@@ -371,7 +371,7 @@ void DebugMessageView::messages_contextMenu(const QPoint &pos)
 
     m_ContextMessage = msg;
 
-    m_ContextMenu->exec(ui->messages->viewport()->mapToGlobal(pos));
+    RDDialog::show(m_ContextMenu, ui->messages->viewport()->mapToGlobal(pos));
   }
 }