Merge branch 'restructure' of git.xx.network:elixxir/client into restructure

auth/confirm.go

auth/receivedRequest.go

auth/state.go

auth/state_test.go

auth/store/confirmation_test.go

auth/store/previousNegotiations.go

auth/store/previousNegotiations_test.go

auth/store/receivedRequest.go

auth/store/sentRequest.go

auth/store/store.go

auth/store/store_test.go

auth/utils_test.go

bindings/fileTransfer.go

cmd/fileTransfer.go

cmix/interface.go

fileTransfer/batchBuilder.go

fileTransfer/callbackTracker/callbackTracker.go

fileTransfer/callbackTracker/callbackTracker_test.go

fileTransfer/callbackTracker/manager.go

fileTransfer/callbackTracker/manager_test.go