#32 Parse IEEE 802.11 wireless LAN management frames

[Erik Hjelmvik]

The management frames shall be added as a sub-packet in the IEEE_802_11Packet class.

Especially interresting info to extract is the SSID parameter name from Probe Requests ("wlan.fc.type_subtype == 0x4" in Wireshark) and Beacon Data.

See "802.11 - 1999.pdf" chapters:
* 7.2.3.1 Beacon frame format
* 7.2.3.8 Probe Request frame format

Each management frame format needs its own class.