Converter tests:

Use generated tests approach in converter tests

Introduce two seperate generated test cases of each of configurations, all tests are generated in both test cases
Test data for plugin configuration has extension "ide.kt", for basic configuration "*.kt"
Test data file is used to determine type of the test (file/class/expression/...) instead of directory, all test data is moved accordingly
Add abstract base classes for generated tests
Rename test folder "file" to "misc" (for the lack of imagination)

j2k/tests/testData/ast/constructors/identifier.ide.kt

@@ -0,0 +1,37 @@
+public open class Identifier(_myName : String, _myHasDollar : Boolean) {
+private val myName : String
+private var myHasDollar : Boolean = false
+private var myNullable : Boolean = true
+public open fun getName() : String {
+return myName
+}
+{
+myName = _myName
+myHasDollar = _myHasDollar
+}
+class object {
+public open fun init(name : String) : Identifier {
+val __ = Identifier(name, false)
+return __
+}
+public open fun init(name : String, isNullable : Boolean) : Identifier {
+val __ = Identifier(name, false)
+__.myNullable = isNullable
+return __
+}
+public open fun init(name : String, hasDollar : Boolean, isNullable : Boolean) : Identifier {
+val __ = Identifier(name, hasDollar)
+__.myNullable = isNullable
+return __
+}
+}
+}
+public open class User() {
+class object {
+public open fun main() : Unit {
+val i1 = Identifier.init("name", false, true)
+val i2 = Identifier.init("name", false)
+val i3 = Identifier.init("name")
+}
+}
+}