"Fine tuning" doings

[mStirner]

There are a couple of things that could be improved.
Instead of creating for every small change a issue, keep track of theme here.

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• unref() all "keep alive"/"broken connection detection" timers + cron + BroadcastChannel's
• remove env var DATABASE_UPDATE_DEBOUNCE_TIMER, context: https://stackoverflow.com/q/77847416/5781499 ¹
• improve signal handling: npm run test runs forever/do not exit #435 (comment) ¹
• unref npm run test child process
• Add config for bin pathes (npm/tar), e.g. BIN_PATH_TAR=/usr/lib/tar, BIN_PATH_NPM=/usr/bin/npm or /usr/bin/env npm//usr/bin/env tar
• Fix or at least create a list of TODO/NOTE comments
• Remove all files prefixed with !, e.g. !class.commands.js
• Remove the fields property from class.logger.js: https://github.com/OpenHausIO/backend/blob/d17066bd3bd43878371d2fa618651068c95ed78c/system/logger/class.logger.js#L50?plain=1
• Rename environment variable HTTP_ADDRESS to HTTP_HOST²
• Remove file ISSUES.md & NOTES.md
• Update Dockerfile base container image to node v20 (currently v16)
• Add path to plugins folder (default to /plugins)
• Check if errors passed to logger functions are the first argument (e.g.: logger.warn(err, "foo bar") and not logger.warn("foo bar", err)
• Create a constants.js: MongoDB ID/MAC regex, Symbols, Components name array, etc.

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• Improve HTTP Testing (Run postman http tests from npm run test #370 (comment))

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^{¹) Needs further investigation if it breaks something or so...
²) Breaking change!}