More deviceInfo details

* switched from parsing build.prop to getprop
* additional details on networking and, if available, storage + provider
* restructured "Device and ROM properties"
deviceInfo: added diskstats to storage details
deviceInfo: Adding sensor details (if available)

- obtained via dumpsys
- not available on all devices/ROMs
- fixed some missing $ADBOPTS along the lines
deviceInfo: making sensor-listing and 'pm list features' optional

- the first takes a little longer, and the second might not always be useful ;)
- added new settings to switch them on/off
- updated sample config and documentation
appDetails: switching to tempname() for safe filename generation (dump)