bangle.js - collect data into memory that survives widget reload

per-app limit for persistent data size

Thing is we're on a very constrained system - if every reboot we have to load all the app.info files and parse them for data, then count it all and check, it's going to make app loads even slower. And I'd go to all that effort and someone would just put 10,000 in for their per-app limit in the metadata anyway :)