Cleanup: Remove TAB chars and std::cerr debug output

Packets: Clean up output formatting in all dump() members
Packets/80211Bundle: RadiotapPacket: Use length header field to get header size
Packets/80211Bundle: Move FCS from WLANPacket to RadiotapPacket
Packets/80211Bundle: Replace WLANPacket variant parsing by three separate packet types for control, management and data frames
Packets/80211Bundle: complete dump() members
Utils/Console: Implement 'ls' command and move old 'ls' to 'll'
Scheduler: ClockService: Handle unset (that is 0) clock_type value explicitly in senf::ClockSservice::abstime()