Event-listening

Feature Merge Request

Related Issue

closes #174 (closed)

Description of Feature

event watching is done in two different ways:

matic/dagger network for kovan-testnet & mainnet (mainnet is not implemented by us but theoretically supported by matic)

websocket-connection to testnet

This MR, listens to Notification-events and filters out those that are not relevant to the user. A TODO in the code marks the place where an assessment-update-action should be dispatched

What's Next?

Next up, we can refactor how assessments are loaded and updated

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