playtime graphs

[DreadKnight]

After #315 will be implemented, some stats should be collected and displayed in nice graphs, similar to how OpenRa project does it on it's website http://openra.ipdx.ru/graphs.html

[DreadKnight]

It seems that Google Analytics can be hooked up to games to collect various stats which should be very handy, a Ludum Dare Excalibur.js game called Kraken did so http://blog.excaliburjs.com/post/87272679712/ludum-dare-29-postmortem-kraken-unchained

Gathered stats could be related to match settings, units materialized, number of materializations, units killed, combos, damage per attack/turn/round/match, healing, movement per turn/round/match, turns, skips, delays, fatigues, winning player (to figure out if there's actually a first move advantage like in chess).

[DreadKnight]

Nakama's admin panel might have some activity stats graphs, will have to check again soon, need to recall the admin link xD
And if we'll switch to Colyseus as of #1788 - it has some graphs to display number of active players at a given time, basic stuff.