We'd like to split up the monster files cppquickfixes.cpp and
cppquickfix_test.cpp by moving non-trivial quickfixes into dedicated files.
Since there will be many of them, we want to have them in a separate
directory. This patch prepares that.
Change-Id: I1e78fab5cce25151662297482582c8043618332e
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
