KT-2579 Rename Range.minus() to reversed and make it extension

#KT-2579 fixed

libraries/stdlib/src/kotlin/Ranges.kt

@@ -0,0 +1,23 @@
+package kotlin
+
+public val CharRange.reversed: CharRange
+    get() = CharRange(end, if (start < end) -size else size)
+
+public val ByteRange.reversed: ByteRange
+    get() = ByteRange(end, if (start < end) -size else size)
+
+public val ShortRange.reversed: ShortRange
+    get() = ShortRange(end, if (start < end) -size else size)
+
+public val IntRange.reversed: IntRange
+    get() = IntRange(end, if (start < end) -size else size)
+
+public val FloatRange.reversed: FloatRange
+    get() = FloatRange(end, if (start < end) -size else size)
+
+public val LongRange.reversed: LongRange
+    get() = LongRange(end, if (start < end) -size else size)
+
+public val DoubleRange.reversed: DoubleRange
+    get() = DoubleRange(end, if (start < end) -size else size)
+