Fixes for EDI input

[zeno979]

In case of network problems (packet loss, high latency and timeouts) EDI inputs tends to become mute also after network connection become back normal, commits addresses this problem

[mpbraendli]

Thanks for the pull request, good improvement in the ODR-DabMux EDI input code. Files in lib are shared with other ODR projects and the main reference is in odr-mmbtools-common so I won't accept the pull request directly here, but first do the changes in the other repository.

I took your improvements and did some changes:

• no #include "Log.hpp" in Socket.cpp because that is also used in projects that don't have Log.hpp
• Changed the return type of decode_afpacket() so that we explicitly distinguish three cases: Ok, Missing data and Error

https://github.com/Opendigitalradio/odr-mmbtools-common/commit/ba7f317f6cadde3d2314f69eef9d7e8658d1c0b3

I've taken these changes into ODR-DabMux with commit 20e7c62. Can you check how this behaves in your test setup?

[mpbraendli]

@zeno979 did you check? Otherwise I'll close this.