fixes #216

fixes #86
fixes #89

fixes #166

Convert list of receipts to map<userId, timestamp>

When you run the docker-image while being offline this step avoids nheko to be build.

fixes #131

When a custom filter is inserted into nheko.conf or there was no filter
defined yet the default filter gets automatically uploaded.
After a successful upload the server-side generated filter-id is used.

This is done async as it is just an enhancement and it is not required
to upload the filter before the first request.

[ci skip]

fixes #199