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Inject PictureLoader as dependency using IPictureLoader
Move code for reading from archives to ArchiveExtractor and inject it as dependency using IArchiveExtractor
Make ArchiveExtractor and PictureLoader instances const
Remove quazip source from project, for now it's external build-time dependency
Remove zlib from project (not needed after QuaZip removal)
Initial CMake conversion
CMake: Fix build for Qt4 (Qt5 build not yet working)
CMake: Add support for Qt5