Reduce use of constants in BLE packet processing

Update to include storing captures in pcap and pcapng format for
LINKTYPE_BLUETOOTH_BREDR_BB and LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR.

Includes:
* Add support for BTLE access address validity determin

Update to include storing captures in pcap and pcapng format for
LINKTYPE_BLUETOOTH_BREDR_BB and LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR.

Includes:
* Add support for BTLE access address validity determination.
* Refactor BTLE support with accessors and opaque internals similar
to BR support.

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