Enhance Webservice

[hpcolus]

I would like to propose to enhance the webservice capabilities of xDrip with data already produced by xDrip app as follows:
Add to webservice stats.son results file (unitised average, standard deviation, A1c, GVI) as stated in
app/src/main/java/com/eveningoutpost/dexdrip/stats/StatsResult.java
Option to produce stats by 1, 7, 30, 90 day interval

Add as webservice systemstat.json similar to what android xdrip shows as 'system status' For a webfollower, for example, it should show last reading, last poll, last wakeup, next poll, last reading time, last poll time. Include if the last data value should be considered stale or not. Include also phone battery level.

Add as a webservice predict.json to send predicted glucose values

@bigdigital Some of these data could be obtained with broadcast API, but webservice is more generic and universal to access and without adding complex communication protocols from client apps.