add WebSockets with STOMP on top

Adds a STOMP broker to the backend. Implements a standalone feedback with messages and topic channels.

This solves #25.

changed milestone to %3.0-beta1

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• dc47f2db...9fd70cee - 52 commits from branch master
• 70ba0f1b - add WebSockets with STOMP on top
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• aa9912d8...d4f1c0a0 - 9 commits from branch master
• e05d39aa - add WebSockets with STOMP on top
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• 2a90cdbe - fix imports/dependencies

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• f4ec61f3 - add WebSockets with STOMP on top
• 743bf5aa - STASH
• f2091c6d - fix imports/dependencies
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• 71e59b26 - refactor ws controllers

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• 2cd7c595 - add WebSockets with STOMP on top

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• 452fb31d - add WebSockets with STOMP on top

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• c111be69 - fix path for tests

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• 752a4f1e - refactor tests

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• 26c29bcc - refactor tests
• 1cef208f - add websocket config to test config

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unmarked as a Work In Progress

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assigned to @dgrh99

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• ea45b97e - add websocket config to test config

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mentioned in merge request arsnova-lite!140 (merged)

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• 728aa8d8 - add WebSockets with STOMP on top
• 9cec4caa - refactor tests
• a71dfd35 - add websocket config to test config

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