add screenshot functionality

[Riot]

and perhaps automatic upload to imgur

[Riot]

Removing milestone: Gold (automated comment)

[Edward Hart-Davis]

Perhaps this could be linked to this issue:

https://bitbucket.org/voxelstorm/sphereface/issues/329/replay-mode

In the sense that you could mark a particular second (or few seconds) for capture, where you can go back after you either win or lose the game, to choose the best frame and then perhaps 'enhance' it in a way with a filter or whatever from the linked-above enhancement.

[Edward Hart-Davis]

...or even do some blurring of, say, a few frames, so you can get a nice 'action screenshot'