v2: Golang Rewrite#4

Draft

lukasklinger wants to merge 9 commits intomasterfrom

Commits on Oct 10, 2021

starting Go rewrite
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enabled PIN authentication
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go mod tidy
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Commits on Oct 11, 2021

added prometheus support, working on websockets
Lukas
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Commits on Oct 12, 2021

moved prometheus middleware
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chat implemented
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updated playback.js
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update comments
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Commits on Oct 13, 2021

working on API
Lukas
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