feat: implement wallpaper cache plugin for dde-services - #61

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The function 'deleteEffectImage' is never used.

The function 'getWallpaperListForScreen' is never used.

The function 'getProcessedImageWithBlur' is never used.

Include file: <QImageReader> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QDateTime> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QFileInfo> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QCryptographicHash> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QFile> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QDir> not found. Please note: Cppcheck does not need standard library headers to get proper results.