backend refactoring from extension properties and proper naming scheme of inner classes and objects

compiler/testData/codegen/regressions/kt249.jet

@@ -1,7 +1,6 @@
 namespace x
 
 class Outer() {
-
     class object {
         class Inner() {
         }

compiler/testData/codegen/regressions/kt344.jet

@@ -176,21 +176,21 @@ fun t12(x: Int) : Int {
 
 fun box(): String {
 /*
-    if (!s0()) return "fail"
-    if (!s1()) return "fail"
-    if (!t1()) return "fail"
-    if (!t2()) return "fail"
-    if (!t3()) return "fail"
-    if (!t4()) return "fail"
-    if (!t5()) return "fail"
-    if (!t6()) return "fail"
-    if (!t7()) return "fail"
-    if (!t8()) return "fail"
-    if (!t9(0)) return "fail"
-    if (!t10()) return "fail"
-    if (t11(1) != 104) return "fail"
+    if (!s0()) return "s0 fail"
+    if (!s1()) return "s1 fail"
+    if (!t1()) return "t1 fail"
+    if (!t2()) return "t2 fail"
+    if (!t3()) return "t3 fail"
+    if (!t4()) return "t4 fail"
+    if (!t5()) return "t5 fail"
+    if (!t6()) return "t6 fail"
+    if (!t7()) return "t7 fail"
+    if (!t8()) return "t8 fail"
+    if (!t9(0)) return "t9 fail"
+    if (!t10()) return "t10 fail"
+    if (t11(1) != 104) return "t11 fail"
 */
-    if (t12(0) != 100) return "fail"
+    if (t12(0) != 100) return "t12 fail"
 
     return "OK"
 }

compiler/testData/codegen/regressions/kt475.jet

@@ -1,14 +1,18 @@
-import java.math.BigDecimal
+import java.util.ArrayList
 
 fun box() : String {
-  // Easy to make BigDecimals user-friendly
-  System.out?.println(
-    "2.00".bd - "1.00"
-  )
-  return "OK"
+  val array = ArrayList<String>()
+  array.add("0")
+  array.add("1")
+  array.add("2")
+  array.last = "5"
+  return if(array.length == 3 && array.last == "5") "OK" else "fail"
 }
 
-val String.bd = BigDecimal(this)
+var <T> ArrayList<T>.length : Int
+    get() = size()
+    set(value: Int) = throw java.lang.Error()
 
-fun BigDecimal.minus(other : BigDecimal) = this.subtract(other)
-fun BigDecimal.minus(other : String) = subtract(other.bd) // this can be omitted
+var <T> ArrayList<T>.last : T
+    get() = get(size()-1)
+    set(el : T) { set(size()-1, el) }

compiler/testData/codegen/super/basicmethod.jet

@@ -1,4 +1,5 @@
 import java.util.ArrayList
+
 trait Tr {
    fun extra() : String = "_"
 }