Refactor time splitter, support computing of dates for time entries

src/NodaConsolidatedNamesForPersinst.php

@@ -82,14 +82,14 @@ final class NodaConsolidatedNamesForPersinst extends NodaConsolidatedNamesAbstra
         $dateString = rtrim($parts[1], ')'); //
 
         if (!empty($dates = NodaTimeSplitter::is_timespan($dateString))
-            && $dates[0] !== '?'
-            && $dates[1] !== '?'
-            && intval($dates[1]) - intval($dates[0]) < 150
+            && $dates->start_year !== '?'
+            && $dates->end_year !== '?'
+            && intval($dates->end_year) - intval($dates->start_year) < 150
         ) {
             return [
                 'name' => $nameOnly,
-                'birth' => $dates[0],
-                'death' => $dates[1],
+                'birth' => $dates->start_year,
+                'death' => $dates->end_year,
             ];
         }