Migrate compiler, idea and others to new case conversion api

compiler/tests-spec/tests/org/jetbrains/kotlin/spec/utils/TestsJsonMapGenerator.kt

@@ -41,7 +41,7 @@ object TestsJsonMapGenerator {
         SECONDARY;
 
         override fun toString(): String {
-            return name.toLowerCase()
+            return name.lowercase()
         }
     }
 

compiler/tests-spec/tests/org/jetbrains/kotlin/spec/utils/TestsStatisticCollector.kt

@@ -43,7 +43,7 @@ object TestsStatisticCollector {
         val statistic = mutableMapOf<TestArea, SpecTestsStatElement>()
 
         for (specTestArea in TestArea.values()) {
-            val specTestsPath = "$SPEC_TESTDATA_PATH/${specTestArea.name.toLowerCase().replace("_", "/")}/${testLinkedType.testDataPath}"
+            val specTestsPath = "$SPEC_TESTDATA_PATH/${specTestArea.name.lowercase().replace("_", "/")}/${testLinkedType.testDataPath}"
 
             statistic[specTestArea] =
                 SpecTestsStatElement(SpecTestsStatElementType.AREA)

compiler/tests-spec/tests/org/jetbrains/kotlin/spec/utils/parsers/CommonParser.kt

@@ -23,7 +23,7 @@ import java.util.regex.Pattern
 object CommonParser {
     fun String.withUnderscores() = replace(" ", "_")
         .replace(File.separator, "_")
-        .toUpperCase()
+        .uppercase()
 
     fun String.splitByComma() = split(Regex(""",\s*"""))
     fun String.splitByPathSeparator() = split(File.separator)

compiler/tests-spec/tests/org/jetbrains/kotlin/spec/utils/parsers/TestInfoParser.kt

@@ -85,8 +85,8 @@ private fun parseImplementationTestInfo(testFilePath: String, linkedTestType: Sp
         testArea = TestArea.valueOf(testInfoByContentMatcher.group("testArea").withUnderscores()),
         testType = TestType.valueOf(testInfoByContentMatcher.group("testType")),
         testNumber = testInfoElements[CommonSpecTestFileInfoElementType.NUMBER]?.content?.toInt() ?: 0,
-        testDescription = fileNameWithoutExtension.toUpperCase()[0] + fileNameWithoutExtension.substring(1)
-            .replace(Regex("""([A-Z])"""), " $1").toLowerCase(),
+        testDescription = fileNameWithoutExtension.uppercase()[0] + fileNameWithoutExtension.substring(1)
+            .replace(Regex("""([A-Z])"""), " $1").lowercase(),
         testInfoElements = testInfoElements,
         testCasesSet = SpecTestCasesSet(mutableMapOf(), mutableMapOf(), mutableMapOf()), //todo
         unexpectedBehavior = testInfoElements.contains(CommonInfoElementType.UNEXPECTED_BEHAVIOUR),

compiler/tests-spec/tests/org/jetbrains/kotlin/spec/utils/spec/HtmlSpecSentencesMapBuilder.kt

@@ -24,7 +24,7 @@ object HtmlSpecSentencesMapBuilder {
         spec.select("$SECTION_SELECTORS, $PARAGRAPH_SELECTORS, .sentence").forEach { element ->
             when {
                 element.`is`(SECTION_SELECTORS) -> {
-                    val sectionTag = SectionTag.valueOf(element.tagName().toLowerCase())
+                    val sectionTag = SectionTag.valueOf(element.tagName().lowercase())
                     while (!currentSectionsPath.empty() && currentSectionsPath.peek().first.level >= sectionTag.level) {
                         currentSectionsPath.pop()
                     }