Add option to open links in new tab by default

[Salgat]

By adding target="_blank" for each link. Would toggled by a button in the bottom right similar to the CSS Enable/Disable button.

[Salgat]

https://www.reddit.com/prefs/ needs to be accounted for. A good way to do this is to automatically check a link to see if a target exists, this is the default preference until the user decides to change it.