Add changes file for 4.12.2

Change-Id: Iece46998b8addeda4f7e501a87e6d62491937774
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

dist/changes-4.12.2.md

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+Qt Creator 4.12.2
+=================
+
+Qt Creator version 4.12.2 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/v4.12.1..v4.12.2
+
+General
+-------
+
+* Fixed line and column support for opening files with Locator
+
+Editing
+-------
+
+### C++
+
+* Fixed persistence of license template setting (QTCREATORBUG-24024)
+* Fixed persistence of diagnostics configurations (QTCREATORBUG-23717)
+
+### QML
+
+* Fixed crash with QML Preview (QTCREATORBUG-24056)
+
+Projects
+--------
+
+### Compilation Database
+
+* Fixed that Kit's toolchain could change (QTCREATORBUG-24047)
+
+Analyzer
+--------
+
+### Clang
+
+* Fixed issue with Clazy 1.6 (QTCREATORBUG-23585)
+
+Version Control Systems
+-----------------------
+
+### Git
+
+* Fixed upstream status for branches with slash
+
+Platforms
+---------
+
+### Android
+
+* Fixed possible crash when Qt is missing in Kit
+
+### WebAssembly
+
+* Fixed running applications with Qt 5.15 (QTCREATORBUG-24072)
+
+### MCU
+
+* Added support for Qt for MCUs 1.2 (UL-1708, UL-2390, QTCREATORBUG-24063, QTCREATORBUG-24052,
+  QTCREATORBUG-24079)
+* Removed support for Qt for MCUs 1.1
+
+Credits for these changes go to:
+--------------------------------
+Alessandro Portale  
+André Pönitz  
+Christian Kandeler  
+Christian Stenger  
+Eike Ziller  
+Leena Miettinen  
+Nikolai Kosjar  
+Orgad Shaneh  
+Tim Jenssen  
+Ulf Hermann