Fork of [Qt 5.6 DDS plugin](https://code.qt.io/cgit/qt/qtimageformats.git/tree/src/plugins/imageformats/dds/qddshandler.cpp?h=5.6) under LGPL2.1. - Merged all files in dds_p.h and dds.cpp - Added support for Qt 6 image allocation limit - Added checks for null image and datastream errors - The plugin is disabled by default CCBUG: 380956 Closes: #12
Closes #10 Added image format test: I pass every image format supported by QImage (except Alpha8) to the plugin and check the result.
