java-decompiler: fixes and cleanups

- console decompiler: resource closing, lookup instead of scan, error reporting
- logger interface reworked
- saver interface renamed
- bytecode provider returns byte array (to reduce stream leakage)
- extra level of context unit avoided
- unneeded exceptions, dead code, formatting

src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java

@@ -387,8 +387,8 @@ public class IdentifierConverter {
 
   private void buildInheritanceTree() {
 
-    HashMap<String, ClassWrapperNode> nodes = new HashMap<String, ClassWrapperNode>();
-    HashMap<String, StructClass> classes = context.getClasses();
+    Map<String, ClassWrapperNode> nodes = new HashMap<String, ClassWrapperNode>();
+    Map<String, StructClass> classes = context.getClasses();
 
     List<ClassWrapperNode> rootClasses = new ArrayList<ClassWrapperNode>();
     List<ClassWrapperNode> rootInterfaces = new ArrayList<ClassWrapperNode>();