Mark inputsplitter & inputtransformer as deprecated

IPython/core/inputsplitter.py

@@ -1,4 +1,6
-"""Input handling and transformation machinery.
+"""DEPRECATED: Input handling and transformation machinery.
+
+This module was deprecated in IPython 7.0, in favour of inputtransformer2.
 
 The first class in this module, :class:`InputSplitter`, is designed to tell when
 input from a line-oriented frontend is complete and should be executed, and when

IPython/core/inputtransformer.py

@@ -1,4 +1,6
-"""Input transformer classes to support IPython special syntax.
+"""DEPRECATED: Input transformer classes to support IPython special syntax.
+
+This module was deprecated in IPython 7.0, in favour of inputtransformer2.
 
 This includes the machinery to recognise and transform ``%magic`` commands,
 ``!system`` commands, ``help?`` querying, prompt stripping, and so forth.

IPython/core/inputtransformer2.py

@@ -1,3 +1,12
+"""Input transformer machinery to support IPython special syntax.
+
+This includes the machinery to recognise and transform ``%magic`` commands,
+``!system`` commands, ``help?`` querying, prompt stripping, and so forth.
+"""
+
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
+
 from codeop import compile_command
 import re
 from typing import List, Tuple