Generate unified data in data build scripts

[nbrooke]

Right now the complication of the individual data sets into the "unified" data that can be loaded quickly is done by the app itself, which is annoying and error prone. There's no reason that the scripts that generate the non-unified data from the source data sets couldn't just do the conversion to the unified form as well, so I think we should try to move towards that some point before we have to do another data update.

[ssawchenko]

Also, as Rob mentioned in a previous PR, we should look into streamlining how we set the current year to avoid having to change it in multiple places in both the Android (GlobalSettings.java) and iOS apps.