Install and ship change logs

And add a menu entry Help > Change Log... (macOS: Qt Creator > Change
Log...) for looking at them.

Change-Id: If444b3ff2465290b9beb4ccbb8d0ddf32a636db4
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>

CMakeLists.txt

@@ -156,6 +156,7 @@ endif()
 
 add_subdirectory(src)
 add_subdirectory(share)
+add_subdirectory(dist)
 
 if (WITH_TESTS)
   add_subdirectory(tests)

dist/CMakeLists.txt

@@ -0,0 +1,11 @@
+# copy resource directories during build
+qtc_copy_to_builddir(copy_changelog_to_builddir
+  DIRECTORIES changelog
+  DESTINATION "${IDE_DATA_PATH}"
+  CREATE_SUBDIRS
+)
+
+install(
+  DIRECTORY changelog
+  DESTINATION ${IDE_DATA_PATH}
+)