Release 7.4.2: Removed properties to update crawler from remote URL from crawler.properties

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The following properties have been removed because auto updates of the crawler aren't necessery any more due to directly using the APIs of the 3rd party service:

- com.openexchange.subscribe.crawler.updatepath
- com.openexchange.subscribe.crawler.updatedfile
- com.openexchange.subscribe.crawler.updateinterval
- com.openexchange.subscribe.crawler.enableautoupdat e
- com.openexchange.subscribe.crawler.onlyupdatealrea dyinstalled