- runs during install/update when an old format file is detected and upgrades it to the current default format which now properly separates Build fields and system properties
- supports all previously used deprecated entries, e.g. BUILD_ID, FIRST_API_LEVEL and VNDK_VERSION
- extracts any missing information for default added fields from the FINGERPRINT
- may also be run manually from command prompt with `sh migrate.sh` or with file explorer app supporting scripts like FX File Explorer
- add back check_resetprop but rename functions to make their use more clear (thanks HuskyDG)
- combine system.prop (runs at post-fs-data) entries into service.sh so that they're only set if needed (note that they therefore wouldn't need to be late props)
- use a uniform style in all scripts (only necessary quoting and brackets, add trailing newlines, spaces not tabs :P)
- remove GMS data pif.prop/pif.json files left over from previous releases to ensure they don't trigger detection at some point (these lines can be removed again in a later release once we're satisfied everyone affected has this resolved)
