Live streaming and online interactivity mean it may be time to reconsider what we mean by live performance, and it's companies such as Coney who are at the vanguardA strange thing happened last year. In my despicable-but-traditional Best of 2013 run-down I ended up wanting to include quite a few things that I hadn't actually left the house to see. Some were shows from the Royal Court's excellent Surprise Theatre stra…