Make app settings merging generic

Implementes a merge_app_settings() function that merges a named setting from all installed apps into the original setting in core.

Attention: For the sake of code deduplication, this change requires all apps to declare themselves in their INSTALLED_APPS setting!

Advances #141 (closed)

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• 61fade20 - Make app settings merging generic

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• c7e1e59b - Make app settings merging generic

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merged

mentioned in commit 5d2aba43