D12574: Support deleting ThemeManager after actiongroup and menu, to fix crash in kmail

[David Faure]

dfaure created this revision.
dfaure added a reviewer: mlaurent.
Restricted Application added a project: KDE PIM.
dfaure requested review of this revision.

REVISION SUMMARY
  We used to leak the ThemeManager. Now that we delete it, it crashed
  because we delete the action group and the menu first. Add support for
  setActionGroup(nullptr) and setThemeMenu(nullptr) so we can clean up while
  everything still exists.

TEST PLAN
  Unittest. The actual fix for kmail requires calling these methods
  in grantleeheaderstyleplugin.

REPOSITORY
  R77 PIM: Grantlee Theme

BRANCH
  Applications/18.04

REVISION DETAIL
  https://phabricator.kde.org/D12574

AFFECTED FILES
  autotest/grantleethememanagertest.cpp
  src/grantleethememanager.cpp

To: dfaure, mlaurent
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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