Migrate deprecations in core, compiler, idea, tests

Replacing deprecated Char.toInt() with Char.code and
Number.toChar() with Number.toInt().toChar(), where Number is not Int.

KT-23451

core/descriptors/src/org/jetbrains/kotlin/resolve/constants/constantValues.kt

@@ -85,7 +85,7 @@ class CharValue(value: Char) : IntegerValueConstant<Char>(value) {
 
     override fun <R, D> accept(visitor: AnnotationArgumentVisitor<R, D>, data: D) = visitor.visitCharValue(this, data)
 
-    override fun toString() = "\\u%04X ('%s')".format(value.toInt(), getPrintablePart(value))
+    override fun toString() = "\\u%04X ('%s')".format(value.code, getPrintablePart(value))
 
     private fun getPrintablePart(c: Char): String = when (c) {
         '\b' -> "\\b"

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/AnnotationDeserializer.kt

@@ -73,7 +73,7 @@ class AnnotationDeserializer(private val module: ModuleDescriptor, private val n
 
         return when (value.type) {
             Type.BYTE -> value.intValue.toByte().letIf(isUnsigned, ::UByteValue, ::ByteValue)
-            Type.CHAR -> CharValue(value.intValue.toChar())
+            Type.CHAR -> CharValue(value.intValue.toInt().toChar())
             Type.SHORT -> value.intValue.toShort().letIf(isUnsigned, ::UShortValue, ::ShortValue)
             Type.INT -> value.intValue.toInt().letIf(isUnsigned, ::UIntValue, ::IntValue)
             Type.LONG -> value.intValue.letIf(isUnsigned, ::ULongValue, ::LongValue)

core/metadata.jvm/src/org/jetbrains/kotlin/metadata/jvm/deserialization/utfEncoding.kt

@@ -62,7 +62,7 @@ fun stringsToBytes(strings: Array<String>): ByteArray {
     var i = 0
     for (s in strings) {
         for (si in 0..s.length - 1) {
-            result[i++] = s[si].toByte()
+            result[i++] = s[si].code.toByte()
         }
     }