Refactor HandlerMethod support in spring-messaging

Introduce base class AbstractMethodMessageHandler for
HandlerMethod-based message handling.

Add MessageCondition interface for mapping conditions to messages
with support for combining type- and method-level annotation
conditions, the ability to match conditions to messages, and also
comparing matches to select the best match.

Issue: SPR-11024

spring-webmvc/src/main/java/org/springframework/web/servlet/handler/AbstractHandlerMethodMapping.java

@@ -337,7 +337,9 @@ public abstract class AbstractHandlerMethodMapping<T> extends AbstractHandlerMap
 
 
 	/**
-	 * A temporary container for a mapping matched to a request.
+	 * A thin wrapper around a matched HandlerMethod and its matched mapping for
+	 * the purpose of comparing the best match with a comparator in the context
+	 * of the current request.
 	 */
 	private class Match {
 

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/condition/PatternsRequestCondition.java

@@ -98,7 +98,6 @@ public final class PatternsRequestCondition extends AbstractRequestCondition<Pat
 
 	/**
 	 * Private constructor accepting a collection of patterns.
-	 * @param fileExtensionResolver
 	 */
 	private PatternsRequestCondition(Collection<String> patterns, UrlPathHelper urlPathHelper,
 			PathMatcher pathMatcher, boolean useSuffixPatternMatch, boolean useTrailingSlashMatch,