Add bbox_cache.properties per SQLFeatureStore

[julianzz98]

This PR replaces the current bbox_cache.properties with bbox_cache_<SQLFeatureStoreId>.properties, therefore enabling the configuration of an individual spatial extend of FeatureTypes with the same name configured in different SQLFeatureStore.

This PR does not solve issue #824!

[tfr42]

Add information about the change to the configuration in https://github.com/deegree/deegree3/wiki/Upgrading-deegree-webservices

[julianzz98]

According to the TMC, a use case should be added for better understanding of the PR. Furthermore the wiki should be updated regarding breaking changes in deegree 3.5-SNAPSHOT.

[tfr42]

The current existing behaviour shall be kept. The new behaviour shall be only applied if a file with the proposed name such as bbox_cache_FEATURE_STORE_ID.properties is present.

[copierrj]

The new behaviour shall be only applied if a file with the proposed name such as bbox_cache_FEATURE_STORE_ID.properties is present.

And perhaps also when no cache exists yet for a feature type present in multiple feature stores?

[julianzz98]

The newly added changes were successfully tested on a local deegree build.