WIP: Event generic

This branch replaces the former, rather slow isCurrentEventActive query by a faster implementation based on large integer division using base 1200.

include/mtime_eventBasic.h

@@ -77,6 +77,12 @@ struct _event_basic_cache
   struct _divisionquotienttimespan quot_eventFirstDateTime;
   struct _divisionquotienttimespan quot_eventLastDateTime;
 
+  /* quot_eventFirstDateTime rounded up. */
+  struct _divisionquotienttimespan quot_eventFirstTriggerDateTime; 
+
+  /* quot_eventLastDateTime rounded downwards. */
+  struct _divisionquotienttimespan quot_eventLastTriggerDateTime;
+
   int64_t plus_slack_ms;
   int64_t minus_slack_ms;
 };