B"H decode more data, etc.

- decodes a bit more information
- misc. small changes
B"H allow disable ports, doc disable net heartbeat
Merge pull request #19 from hhm0/decoding

decode more squawk codes
Merge pull request #20 from hhm0/network_disabling

make network services disable-able
Merge remote-tracking branch 'origin/master' into mods