Add a configuration file to ndpiReader

[IvanNardi]

Example:
./example/ndpiReader --conf=./example/calls.conf -i ./tests/pcap/signal_videocall.pcapng -v2

Close #2608

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[utoni]

Is it necessary that all config file options need to start with --cfg=? A more intuitive config file would be something like key.subkey = value.

[IvanNardi]

Is it necessary that all config file options need to start with --cfg=? A more intuitive config file would be something like key.subkey = value.

The big advantage of the proposed solution is to keep the same format between ndpiReader command line options and the configuration file: you can simply copy the string between them.

BTW, not ALL config file options start with --cfg= but only the libnDPI ones; ndpiReader options are different (for example -U 0 -p proto.file -P 4:8:10:16:25) but you can copy also the latter as-is into the configuration file.

In other words, for me, the goal of this file is not to be automatically generated, but simply to provide you an easy way to collect all your options together and call them easily via command line