Merge pull request #4568 from ipfs/feat/cmds1.0

cmd/ipfs/daemon.go

cmd/ipfs/init.go

cmd/ipfs/ipfs.go

cmd/ipfs/main.go

cmd/ipfs/main_test.go

cmd/ipfswatch/main.go

commands/command.go

commands/command_test.go

commands/legacy/command.go

commands/legacy/legacy.go

commands/legacy/legacy_test.go

commands/legacy/request.go

commands/legacy/response.go

commands/legacy/responseemitter.go

commands/request.go

commands/response.go

commands/response_test.go

core/commands/active.go

core/commands/add.go

core/commands/bitswap.go