Java to Kotlin converter: supported try-with-resource construct, fixed anonymous class generation + fixed a bug with method return type

#KT-4488 Fixed

idea/src/org/jetbrains/jet/plugin/actions/JavaToKotlinAction.java

@@ -52,7 +52,7 @@ public class JavaToKotlinAction extends AnAction {
             return;
         }
 
-        final Converter converter = new Converter(project, ConverterSettings.defaultSettings, new FilesConversionScope(selectedJavaFiles));
+        final Converter converter = Converter.object$.create(project, ConverterSettings.defaultSettings, new FilesConversionScope(selectedJavaFiles));
         CommandProcessor.getInstance().executeCommand(
                 project,
                 new Runnable() {

idea/src/org/jetbrains/jet/plugin/conversion/copy/ConvertJavaCopyPastePostProcessor.kt

@@ -79,7 +79,7 @@ public class ConvertJavaCopyPastePostProcessor() : CopyPastePostProcessor<TextBl
     }
 
     private fun convertCopiedCodeToKotlin(code: CopiedCode, file: PsiJavaFile): String {
-        val converter = Converter(file.getProject(), ConverterSettings.defaultSettings, FilesConversionScope(listOf(file)))
+        val converter = Converter.create(file.getProject(), ConverterSettings.defaultSettings, FilesConversionScope(listOf(file)))
         val startOffsets = code.getStartOffsets()
         val endOffsets = code.getEndOffsets()
         assert(startOffsets.size == endOffsets.size) { "Must have the same size" }