mapping-tools: Name the cache after the date #30

As the tables are now externalized, they can change independently of the mapping-tools version.
However, the caches still contain the old values of the mapping tables.
Therefore, they need to be flushed/removed regularly to ensure that the correct values are in the cache relatively quickly.
We have chosen to incorporate the current date into the cache name, so that we have one cache per day.
In principle, caches from previous days should not be used anymore, and there is a script that deletes those that have not been used for some time.

mapping-tools: Name the cache after the date