In app tx related notifications improvements

[saledjenic]

Improve notifications within the app when the tx is placed/pending/confirmed.

At this moment notifications are a bit intertwined.

Signals that need to be revised:

const SIGNAL_OWNER_TOKEN_SENT* = "ownerTokenSent"
const SIGNAL_TRANSACTION_SENDING_COMPLETE* = "transactionSendingComplete"
const SIGNAL_TRANSACTION_STATUS_CHANGED* = "transactionStatusChanged"