Minimize transient garbage creation identified by allocation profiling

* UURIFactory, canonicalize/**, PathologicalPathDecideRule, ExtractorHTML
    use recycled matchers via TextUtils
* CrawlURI, KeyedProperties, OverlayContext, SheetOverlaysManager
    use ArrayList and indexed access rather than LinkedList and iterator instances

engine/src/main/java/org/archive/crawler/spring/SheetOverlaysManager.java

@@ -315,7 +315,7 @@ BeanFactoryAware, OverlayMapsSource, ApplicationListener {
         List<String> foundPrefixes = PrefixFinder.findKeys(sheetNamesBySurt, effectiveSurt);       
         for(String prefix : foundPrefixes) {
             for(String name : sheetNamesBySurt.get(prefix)) {
-                curi.getOverlayNames().push(name);
+                curi.getOverlayNames().add(name);
             }
         }
         // apply deciderule-based overlays