add bftool script: diff, mask and decode bitfields
add bftool script: diff, mask and decode bitfields

envytools/envytools,MoochMcGee/envytools,hakzsam/envytools,karolherbst/envytools,karolherbst/envytools,pierremoreau/envytools,karolherbst/envytools,MoochMcGee/envytools,envytools/envytools,grate-driver/envytools,pierremoreau/envytools,pierremoreau/envytools,karolherbst/envytools,MoochMcGee/envytools,karolherbst/envytools,envytools/envytools,envytools/envytools,MoochMcGee/envytools,MoochMcGee/envytools,envytools/envytools,grate-driver/envytools,pierremoreau/envytools,grate-driver/envytools,grate-driver/envytools,kfractal/envytools,kfractal/envytools,pierremoreau/envytools,kfractal/envytools,hakzsam/envytools,hakzsam/envytools,hakzsam/envytools,kfractal/envytools,grate-driver/envytools,hakzsam/envytools,kfractal/envytools