`xtga::flags::IMAGETYPE : uchar` misses `HUFFMAN_DELTA_RLE` encodings

[jopadan]

According to Creating TGA Image files

namespace xtga::flags
{
        enum class IMAGETYPE : uchar
        {
                NONE                                           = 0x00, /*!< No image data present. */
                COLOR_MAPPED                                   = 0x01, /*!< Uncompressed Color Mapped. */
                TRUE_COLOR                                     = 0x02, /*!< Uncompressed True Color. */
                GRAYSCALE                                      = 0x03, /*!< Uncompressed Grayscale. */
                COLOR_MAPPED_RLE                               = 0x09, /*!< Run-length encoded Color Mapped. */
                TRUE_COLOR_RLE                                 = 0x0A, /*!< Run-length encoded True Color. */
                GRAYSCALE_RLE                                  = 0x0B, /*!< Run-length encoded Grayscale. */
                COLOR_MAPPED_HUFFMAN_DELTA_RLE                 = 0x20, /*!< Huffman-Delta-Run-length encoded Color Mapped */
                COLOR_MAPPED_HUFFMAN_DELTA_RLE_4_PASS_QUADTREE = 0x21, /*!< Huffman-Delta-Run-length-4-Pass-Quadtree encoded Color Mapped */
        };
}