Bit Flag Renderer QGIS 4 compatibility

<p>The Bit Flag Render plugin allows to visualize the state of single bits in raster bands of with data type byte or integer.</p><h1>Features</h1><ul><li>visualizes bit flags consisting of 1 to 3 bits (from 2 (on/off) to 8 different states)</li><li>layer legend shows flag state colors</li><li>predefined flag schemes, e.g. for <a href="https://www.usgs.gov/landsat-missions/landsat-surface-reflectance-quality-assessment">Landsat Quality Assessment (QA) bands</a></li><li>allows to specify, save and reload flag schemes</li><li>Documentation <a href="https://bit-flag-renderer.readthedocs.io/en/latest">https://bit-flag-renderer.readthedocs.io/en/latest</a></li><li>Repository <a href="https://bitbucket.org/jakimowb/bit-flag-renderer">https://bitbucket.org/jakimowb/bit-flag-renderer</a></li></ul><p>The Bit Flag Renderer is developed at Humboldt-Universität zu Berlin, <a href="https://hu-berlin.de/eo-lab">Earth Observation Lab</a> as part of the <a href="https://eo.belspo.be/en/stereo-in-action/projects/remote-sensing-image-processing-algorithms-land-use-and-land-cover">Land Use Monitoring System (LUMOS)</a> project. LUMOS was funded by the Belgian Science Policy Office as part of the Stereo-III research program (grant no. SR/01/349).</p>