A PCAP/Pcapng reader has been implemented to support parsing the
PCAPdroid extensions metadata. This allows displaying a number of
information in the UI when loading from a Pcapng file, in particular:
- when the dump was generated with root, show the capture interface
name
- show the UID (app) related to a given connection
- if the dump contains UIDs of uninstalled apps, show the
original package name and app name
Closes#479