Replace 'class object' with 'default object' in renderers and test data

Includes changes to decompiled text
Old syntax is used in builtins and project code for now

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/classObjectVal.kt

@@ -10,7 +10,7 @@ class MyClass {
         val a = 1
     }
 
-    class object {
+    default object {
         val coProp = 1
     }
 }

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/dependentOnFile.kt

@@ -8,7 +8,7 @@ fun main(args: Array<String>) {
 class TestClass {
     fun testFun() = 1
 
-    class object {
+    default object {
         val p = 1
     }
 }

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/frame/frameClassObject.kt

@@ -5,7 +5,7 @@ fun main(args: Array<String>) {
 }
 
 class A {
-    class object {
+    default object {
         val prop = 1
         fun myFun() = 1
     }