Migrate compiler, idea and others to new case conversion api

plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/incremental/incrementalProcessorDiscovery.kt

@@ -53,7 +53,7 @@ private fun processSingleClasspathEntry(rootFile: File): Map<String, DeclaredPro
     for (line in text) {
         val parts = line.split(",")
         if (parts.size == 2) {
-            val kind = parts[1].toUpperCase(Locale.ENGLISH)
+            val kind = parts[1].uppercase()
             if (INCREMENTAL_DECLARED_TYPES.contains(kind)) {
                 nameToType[parts[0]] = enumValueOf(kind)
             }

plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/incremental/incrementalProcessors.kt

@@ -50,7 +50,7 @@ class IncrementalProcessor(private val processor: Processor, private val kind: D
             if (fromOptions == null) {
                 RuntimeProcType.NON_INCREMENTAL
             } else {
-                val declaredType = fromOptions.drop("org.gradle.annotation.processing.".length).toUpperCase(Locale.US)
+                val declaredType = fromOptions.drop("org.gradle.annotation.processing.".length).uppercase()
                 if (ALLOWED_RUNTIME_TYPES.contains(declaredType)) {
                     enumValueOf(declaredType)
                 } else {

plugins/kapt3/kapt3-base/test/JavaKaptContextTest.kt

@@ -36,7 +36,8 @@ class JavaKaptContextTest : TestCase() {
                         val annotatedElements = roundEnv.getElementsAnnotatedWith(annotation)
 
                         for (annotatedElement in annotatedElements) {
-                            val generatedClassName = annotatedElement.simpleName.toString().capitalize() + annotationName.capitalize()
+                            val generatedClassName = annotatedElement.simpleName.toString().replaceFirstChar(Char::uppercaseChar) +
+                                    annotationName.replaceFirstChar(Char::uppercaseChar)
                             val file = processingEnv.filer.createSourceFile("generated." + generatedClassName)
                             file.openWriter().use {
                                 it.write(

plugins/kapt3/kapt3-base/test/KaptPathsTest.kt

@@ -15,7 +15,7 @@ import java.nio.file.Files
 class KaptPathsTest : TestCase() {
     @Test
     fun testSymbolicLinks() {
-        if (System.getProperty("os.name").toLowerCase().contains("win")) return
+        if (System.getProperty("os.name").lowercase().contains("win")) return
         val tempDir = Files.createTempDirectory("kapt-test").toFile()
         try {
             fun File.writeJavaClass() = apply {