NING-13330 - Adding the ability to limit the size of individual rollup groups by including the property rollupKeepLast to incoming feed events.  Also making events with the same rollup key count as a single event when calculating the 1000 event cap, and making the 1000 event cap configurable with the config property collector.spoolWriter.feedEvent.storage.limit
NING-13332: Making configuration of some properties of event processing more versatile, so that different events can be treated differently.  Specifically we can now use different sets of spool processors on different event types as well as buffer events to file for different periods of time.  This allows some events to be flushed more quickly than others to the spoolers