Backstabbr Helper per Alex Ward

Backstabbr Helper adds more functionality to the Diplomacy games available at backstabbr.com.

Features include:
- "Private mode" features for when you are playing in a situation where your 'allies' share a space with you. (office, school).
- Space bar enables emergency "private mode" which will blur your whole screen.
- "Private mode" can be enabled from the menu, which will hide your moves arrows, and blur your order panel.
- "Hide tooltips" removes the tooltip when hovering over the map.
- "Screenshot" will capture the map as a .png image from the first open backstabbr tab.