fix: t6 modman textures (#849)

* feat: dynamically decompress bc5 textures for modman

* chore: restructure image format class

* chore: keep dds file conversions

* chore: convert all kinds of webgl unsupported formats

* chore: add decompressors for remaining formats

* chore: always set full alpha if available on bc4 and bc5 decompression

src/ObjImage/Image/Dx9TextureLoader.cpp

@@ -16,7 +16,7 @@ namespace image
 
     const ImageFormat* Dx9TextureLoader::GetFormatForDx9Format() const
     {
-        for (const auto* i : ImageFormat::ALL_FORMATS)
+        for (const auto* i : format::ALL)
         {
             if (i->GetD3DFormat() == m_format)
                 return i;