The summarising functionality for continuous variables in `output/sc2egset_replaypack_processor/XXX/XXX_summary.json` is weird

A very minor suggestion - the summary json correctly summarises discrete variables like matchups by counts of the individual categories. However, it does the same with continuous variables like `gameTimes`, where each value is unique, so the JSON has stuff like:

```
"gameTimes":{"1000.044643":1,"1006.339286":1,"1010.580357":1,"1023.303571":1,"1028.169643":1,"1032.946429":1,"1033.973214":1,"1041.741071":1,"1046.562500":1,"1064.196429":1,"1081.651786":1,"1084.151786":1,"1105.580357":1,"1149.732143":1,"1157.946429":1,"1159.241071":1,"1195.892857":1,"1196.428571":1,"1196.473214":1,"1200.491071":1,"1206.696429":1,"1225.982143":1,"1229.062500":1,"1255.178571":1,"1272.187500":1,"1272.589286":1,"1279.062500":1,"1282.991071":1,"1332.857143":1,"1381.116071":1,"1402.723214":1,"141.517857":1,"1422.812500":1,"1428.080357":1,"1434.017857":1,"1447.678571":1,"1453.348214":1,"1506.607143":1,"1506.651786":1,"1533.035714":1,"1554.866071":1,"1567.232143":1,"1645.089286":1,"1686.517857":1,"1689.107143":1,"1696.383929":1,"1705.267857":1,"1737.544643":1,"1810.267857":1,"191.339286":1,
....
```

It would probably make more sense to summarise with something like mean, sd and range (or just not summarise at all).