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Build process

1. merge all files that fit the conditions and configuration
2. read in all lines that fit the pattern set $.*
3. parse them into a map key -> value
4. Resolve all indirect assignments (e.g. set $bla $blub)
5. merge additional context from i3configger.json and .message.json
6. Replace all variables in configs with their values
7. Write results
8. If config is valid: replace and reload. If not: leave the old configuration in place