Commits: Support buffering SystemDependent GraphicData -> https://cgit.freedesktop.org/libreoffice/core/commit/?id=80b287ad0322afcbf8f80b0507e212870dcf0f98 Support buffering SystemDependent GraphicData (II) -> https://cgit.freedesktop.org/libreoffice/core/commit/?id=7034311dce663c895577267110baadbec312d491 Support buffering SystemDependent GraphicData (III) -> https://cgit.freedesktop.org/libreoffice/core/commit/?id=66232248ff55639052ddb76918d555e21dc9c46b Support estimateUsageInBytes for SystemDependentData -> https://cgit.freedesktop.org/libreoffice/core/commit/?id=e650279db77281fe98aaff28e31c2269611c31e4