Move PagedSeq from scala-library to parser-combinators

[gourlaysama]

This moves scala.collection.immutable.PagedSeq to the
scala.util.parsing.input package, after it was deprecated over there
(see SI-9503).

The only real bit of change doesn't show on the diff because it is a new
file, so here is the diff between the scala-library version and this
one:

diff --git i/shared/src/main/scala/scala/util/parsing/input/PagedSeq.scala w/shared/src/main/scala/scala/util/parsing/input/PagedSeq.scala
index 01854b1..ba12ec2 100644
--- i/shared/src/main/scala/scala/util/parsing/input/PagedSeq.scala
+++ w/shared/src/main/scala/scala/util/parsing/input/PagedSeq.scala
@@ -9,10 +9,9 @@

 package scala
-package collection
-package immutable
+package util.parsing.input

-import java.io.{File, FileReader, Reader}
+import java.io.{File, FileReader, Reader => JReader}
 import scala.reflect.ClassTag

 /** The `PagedSeq` object defines a lazy implementations of
@@ -20,9 +19,7 @@ import scala.reflect.ClassTag
  *
  * Provides utility methods that return instances of `PagedSeq[Char]`.
  * `fromIterator` and `fromIterable` provide generalised instances of `PagedSeq`
- *  @since 2.7
  */
-@deprecated("this object will be moved to the scala-parser-combinators module", "2.11.8")
 object PagedSeq {
   final val UndeterminedEnd = Int.MaxValue

@@ -85,7 +82,7 @@ object PagedSeq {

   /** Constructs a paged character sequence from an input reader
    */
-  def fromReader(source: Reader): PagedSeq[Char] =
+  def fromReader(source: JReader): PagedSeq[Char] =
     new PagedSeq(source.read(_: Array[Char], _: Int, _: Int))

   /** Constructs a paged character sequence from an input file
@@ -120,13 +117,11 @@ import PagedSeq._
  *  @tparam T     the type of the elements contained in this paged sequence, with an `ClassTag` context bound.
  *
  *  @author Martin Odersky
- *  @since  2.7
  *  @define Coll `PagedSeq`
  *  @define coll paged sequence
  *  @define mayNotTerminateInf
  *  @define willNotTerminateInf
  */
-@deprecated("this class will be moved to the scala-parser-combinators module", "2.11.8")
 class PagedSeq[T: ClassTag] protected(
   more: (Array[T], Int, Int) => Int,
   first1: Page[T],

Fixes #71

[SethTisue]

🎉

[SethTisue]

@gourlaysama would a PR backporting this change to 1.0.x be accepted...?