commit 7ae543b70a1ff000c19cc318083546f654834b96 (origin/kazakov/shift-gesture-slowdown)
Author: Dmitry Kazakov <dimula73@gmail.com>
Date:   Thu Sep 15 20:18:34 2016 +0300

    Forbid conversion of KisPaintOpSettingsSP into raw pointer

    Now we have the following concepts:

    1) KisRestrictedSharedPtr --- a KisShared-based shared pointer that
       forbids implicit creation of a shared pointer from raw pointer.
       One should first create a usual shared pointer and assign it to
       a restricted one. Is resolves the issue of accidentally passing
       this pointer into a shared pointer and getting into troubles because
       of that.

    2) KisPinnedSharedPtr --- a KisShared-based shared pointer that forbids
       implicit conversion into a raw pointer. Therefore, you cannot delete
       this pointer.

    3) When we port the settings into QSharedPointer, both classes will not
       be needed anymore, because QSharedPointer has both the properties :)