Add flag for building bluez linked tools
Make flag optional if libbluetooth is installed
Add USE_PCAP flag to force use of pcap (same as libBluetooth)
Minor fix to a comment
Update release script to restructure release package
le: reset CC2400 and DMA engine when exiting modes

Gracefully exit modes when stopped using ubertooth-util -S. Prior to
this standard operating procedure was to unplug and replug.
le: remove extraneous LED indication
common: move operating mode definitions into firmware include
firmware: parameterize DMA interrupt handler
Adopt updated libbtbb with pcap and pcapng captures.

Other items:
* allow consistent use of LIB_SUFFIX between libbtbb and ubertooth
* update cc2400 power conversion to model datasheet piece-wise linear