[java] adds support for Java 9's improved try-with-resources (IDEA-140266)

PSI, parser, highlighting, exception analysis, control flow, completion.

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting8/UnsupportedFeatures.java

@@ -0,0 +1,8 @@
+import java.io.*;
+
+class UnsupportedFeatures {
+  void m() throws Exception {
+    Reader r1 = new FileReader("/dev/null");
+    try (<error descr="Resource references are not supported at this language level">r1</error>; Reader r2 = new FileReader("/dev/null")) { }
+  }
+}