Messenger example - clean up

See merge request elixxir/elixxir-dapps-sdk-swift!74

Update deprecation annotations

See merge request elixxir/elixxir-dapps-sdk-swift!73

Remove unused property of FileTransferSend.Params

See merge request elixxir/elixxir-dapps-sdk-swift!72

Update Bindings

See merge request elixxir/elixxir-dapps-sdk-swift!67

elixxir/client@a3ffe7a6
go version go1.17.13 darwin/arm64
Xcode 13.4.1 Build version 13F100
gomobile bind target: ios,iossimulator,macos

Messenger example - send auth request

See merge request elixxir/elixxir-dapps-sdk-swift!68

Fact improvements & helpers

See merge request elixxir/elixxir-dapps-sdk-swift!71