A multichannel HFDL (High Frequency Data Link) decoder.

Features:
* Decodes multiple channels simultaneously, up to available CPU
power and SDR bandwidth (no fixed channel count limit)
* Interfaces directly with SDR hardware via SoapySDR library
(no pipes / virtual audio cables needed)
* Reads prerecorded I/Q data from a file
* Automatically reassembles multiblock ACARS messages and MIAM
file transfers
* Supports various outputs and output formats (see below)
* Enriches logged messages with data from external sources:
* - ground station details - from the system table file
* - aircraft data - from Basestation SQLite database
* Extracts aircraft position information from decoded messages
and provides a data feed for external plane tracking apps
(eg. Virtual Radar Server)
* Produces decoding statistics using Etsy StatsD protocol