Local objects (#215)

* bug fix

* bug fix with nested inner classes

* - fixed FixMeInner
- support of inner classes in local classes
- support of object expressions in initializers

* comments

* merged modification

* - review fixes
- tests

* review fixes

* review fixes

backend.native/tests/codegen/localClass/localHierarchy.kt

@@ -0,0 +1,15 @@
+fun foo(s: String): String {
+    open class Local {
+        fun f() = s
+    }
+
+    open class Derived: Local() {
+        fun g() = f()
+    }
+
+    return Derived().g()
+}
+
+fun main(args: Array<String>) {
+    println(foo("OK"))
+}