update python scripts to python3
examples: renamed le_counter to gatt_counter and le_streamer to le_streamer_server to indicate suppport for GATT over BR/EDR
samv71-xplained-atwilc3000: fix port
samv71-xplained-atwilc3000: update build and readme
samv71-xplained-atwilc3000: disable classic
samv71-xplained-atwilc3000: fix build
samv71-xplained-atwilc3000: support firmware download as part of build
samv71-xplained-atwilc3000: build all examples