Migrate compiler, idea and others to new case conversion api

compiler/android-tests/tests/org/jetbrains/kotlin/android/tests/CodegenTestsOnAndroidGenerator.kt

@@ -262,7 +262,7 @@ class CodegenTestsOnAndroidGenerator private constructor(private val pathManager
 
         private fun getFlavorUnitTestFolder(flavourName: String): String {
             return pathManager.srcFolderInAndroidTmpFolder +
-                    "/androidTest${flavourName.capitalize()}/java/" +
+                    "/androidTest${flavourName.replaceFirstChar(Char::uppercaseChar)}/java/" +
                     testClassPackage.replace(".", "/") + "/"
         }
 
@@ -379,7 +379,7 @@ class CodegenTestsOnAndroidGenerator private constructor(private val pathManager
             configure(backend)
             testInfo = KotlinTestInfo(
                 "org.jetbrains.kotlin.android.tests.AndroidRunner",
-                "test${testDataFile.nameWithoutExtension.capitalize()}",
+                "test${testDataFile.nameWithoutExtension.replaceFirstChar(Char::uppercaseChar)}",
                 emptySet()
             )
         }.build(testDataFile.path)

compiler/android-tests/tests/org/jetbrains/kotlin/android/tests/UnitTestFileWriter.kt

@@ -27,7 +27,7 @@ class UnitTestFileWriter(
     }
 
     fun generate() {
-        FileWriter(File(flavourFolder, flavourName.capitalize() + ".java").also { it.parentFile.mkdirs() }).use { suite ->
+        FileWriter(File(flavourFolder, flavourName.replaceFirstChar(Char::uppercaseChar) + ".java").also { it.parentFile.mkdirs() }).use { suite ->
             val p = Printer(suite)
             p.println(
                 """package ${CodegenTestsOnAndroidGenerator.testClassPackage};
@@ -35,7 +35,7 @@ class UnitTestFileWriter(
                 |import ${CodegenTestsOnAndroidGenerator.baseTestClassPackage}.${CodegenTestsOnAndroidGenerator.baseTestClassName};
                 |
                 |/* This class is generated by ${CodegenTestsOnAndroidGenerator.generatorName}. DO NOT MODIFY MANUALLY */
-                |public class ${flavourName.capitalize()} extends ${CodegenTestsOnAndroidGenerator.baseTestClassName} {
+                |public class ${flavourName.replaceFirstChar(Char::uppercaseChar)} extends ${CodegenTestsOnAndroidGenerator.baseTestClassName} {
                 |
             """.trimMargin()
             )