Added an 's' option to force cracking strategy
Added an 's' option to force cracking strategy

Some PCAP files containing BLUETOOTH_LE_LL_WITH_PHDR packets did
not work correctly because of a poor automated strategy selection
so this option gives the possibility for a user to specify the
correct strategy (or just use them as he/she wish).

mikeryan/crackle,mikeryan/crackle