Rework packet filters by using 802.11 frame types and subtypes
Use a filter map of 16 bit for subtypes. E.g. Beacon is MGMT frame subtype 8 (binary 1000), so when bit 8 of filter_stype is set we will see beacons. That way we can define the filters more exactly. TODO: What's missing is to redefine the characters used for each frame type so they are unique and can be selected in the filter window.
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