Add changes file for 4.7.1

Change-Id: I95ec99d566ae77313f7e729d886f7c23ac9ace28
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

dist/changes-4.7.1.md

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+Qt Creator version 4.7.1 contains bug fixes.
+
+The most important changes are listed in this document. For a complete
+list of changes, see the Git log for the Qt Creator sources that
+you can check out from the public Git repository. For example:
+
+    git clone git://code.qt.io/qt-creator/qt-creator.git
+    git log --cherry-pick --pretty=oneline origin/v4.7.0..v4.7.1
+
+Editing
+
+* Fixed that generic highlighting could use unreadable colors
+  (QTCREATORBUG-20919)
+
+Qbs Projects
+
+* Fixed C++ version passed to code model (QTCREATORBUG-20909)
+
+C++ Support
+
+* Clang Code Model
+    * Fixed include order for Clang headers
+
+Debugging
+
+* Fixed remote debugging command line argument (QTCREATORBUG-20928)
+* GDB
+    * Fixed GDB built-in pretty printer handling (QTCREATORBUG-20770)
+* CDB
+    * Fixed pretty printing of enums
+* QML
+    * Fixed re-enabling breakpoints (QTCREATORBUG-20795)
+    * Fixed `Attach to QML Port` (QTCREATORBUG-20168)
+
+Platform Specific
+
+Windows
+
+* Improved resource consumption of MSVC detection, which prompted some
+  Anti-Virus software to block Qt Creator (QTCREATORBUG-20829)
+* Fixed that Qt Creator forced use of ANGLE on user applications
+  (QTCREATORBUG-20808)
+* Fixed MSVC toolchain detection for Windows SKD 7 (QTCREATORBUG-18328)
+
+Remote Linux
+
+* Switched SSH support to use Botan 2 (QTCREATORBUG-18802)
+
+Credits for these changes go to:  
+Andre Hartmann  
+André Pönitz  
+Christian Kandeler  
+Christian Stenger  
+David Schulz  
+Eike Ziller  
+Hannes Domani  
+Ivan Donchevskii  
+Leena Miettinen  
+Marco Benelli  
+Orgad Shaneh  
+Robert Löhning  
+scootergrisen  
+Sergey Belyashov  
+Thomas Hartmann  
+Tobias Hunger  
+Ulf Hermann