D16118: Fix crash on startup

[Albert Astals Cid]

aacid created this revision.
Herald added a reviewer: KDE Games.
Herald added a subscriber: kde-games-devel.
aacid requested review of this revision.

REVISION SUMMARY
  There was various threads using the same kconfig[group] at the same time, so bad things happened.
  Add a mutex
  
  BUGS: 398416

TEST PLAN
  Run
  
    rm -f ~/.config/palapeli* && palapeli
  
  a few times, see it doesn't crash anymore

REPOSITORY
  R423 Palapeli

BRANCH
  Applications/18.08

REVISION DETAIL
  https://phabricator.kde.org/D16118

AFFECTED FILES
  src/file-io/collection.cpp
  src/file-io/collection.h
  src/file-io/components-collectionstorage.cpp
  src/file-io/components.h

To: aacid, #kde_games
Cc: kde-games-devel
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