Make Char.category and directionality properties instead of functions.

Provide contains(Char) operator for CharCategory.

libraries/stdlib/src/kotlin/text/CharCategoryJVM.kt

@@ -154,6 +154,11 @@ public enum class CharCategory(public val value: Int, public val code: String) {
      */
     FINAL_QUOTE_PUNCTUATION(Character.FINAL_QUOTE_PUNCTUATION.toInt(), "Pf");
 
+    /**
+     * Returns `true` if [char] character belongs to this category.
+     */
+    public operator fun contains(char: Char): Boolean = Character.getType(char) == this.value
+
 
     public companion object {
         private val categoryMap by lazy { CharCategory.values().toMap { it.value } }

libraries/stdlib/src/kotlin/text/CharJVM.kt

@@ -102,12 +102,25 @@ public fun Char.toTitleCase(): Char = Character.toTitleCase(this)
 /**
  * Returns a value indicating a character's general category.
  */
-public fun Char.category(): CharCategory = CharCategory.valueOf(Character.getType(this))
+@Deprecated("Use 'category' property instead.", ReplaceWith("category"))
+public fun Char.category(): CharCategory = category
+
+/**
+ * Returns a value indicating a character's general category.
+ */
+public val Char.category: CharCategory get() = CharCategory.valueOf(Character.getType(this))
+
 
 /**
  * Returns the Unicode directionality property for the given character.
  */
-public fun Char.directionality(): CharDirectionality = CharDirectionality.valueOf(Character.getDirectionality(this).toInt())
+@Deprecated("Use 'directionality' property instead.", ReplaceWith("directionality"))
+public fun Char.directionality(): CharDirectionality = directionality
+
+/**
+ * Returns the Unicode directionality property for the given character.
+ */
+public val Char.directionality: CharDirectionality get() = CharDirectionality.valueOf(Character.getDirectionality(this).toInt())
 
 // TODO Provide name for JVM7+
 ///**