Disables text highlighting in MS Edge

[RationalRabbit]

This code disables the ability to highlight text in MS Edge and Chrome. This is easy enough to avoid pre-initialization by not initializing until it is needed (I simply load it with a link: (onclick="_init(); _showDialog();"). I am not adept enough to know the proper way to remove this event listener. So once it is opened, the user loses the ability to highlight text. This seems to only be a problem in Edge and Chrome.