Capitalize/decapitalize only ASCII characters across project

Use {de,}capitalizeAsciiOnly and to{Lower,Upper}CaseAsciiOnly where
possible, and stdlib's functions with Locale.US everywhere else.

Otherwise, if the default system locale is Turkish, the capital latin
letter "I" is transformed in toLowerCase to "ı" (see
https://github.com/JetBrains/kotlin/blob/66bc142f92085047a1ca64f9a291f0496e33dd98/libraries/stdlib/jvm/test/text/StringJVMTest.kt#L119),
which for example breaks the codegen for `intArrayOf` in
KT-25400/KT-43405.

Similarly, lower case latin letter "i" is transformed to "İ".

 #KT-13631 Fixed
 #KT-25400 Fixed
 #KT-43405 Fixed

compiler/cli/src/org/jetbrains/kotlin/cli/common/messages/PlainTextMessageRenderer.java

@@ -23,6 +23,7 @@ import org.fusesource.jansi.Ansi;
 import org.fusesource.jansi.internal.CLibrary;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.util.capitalizeDecapitalize.CapitalizeDecapitalizeKt;
 
 import java.util.EnumSet;
 import java.util.Set;
@@ -130,7 +131,7 @@ public abstract class PlainTextMessageRenderer implements MessageRenderer {
             return message;
         }
 
-        return StringsKt.decapitalize(message);
+        return CapitalizeDecapitalizeKt.decapitalizeAsciiOnly(message);
     }
 
     @NotNull