21.3.0

• bn::regular_bg_tiles_ptr::overwrite_tile, bn::affine_bg_tiles_ptr::overwrite_tile and BN_CFG_BG_BLOCKS_MAX_OVERWRITE_TILES added.
• bn::regular_bg_tiles_ptr::bpp added.
• bn::regular_bg_tiles_ptr::offset and bn::affine_bg_tiles_ptr::offset added.
• BN_CFG_AUDIO_MAX_SOUND_CHANNELS and BN_CFG_SPRITE_TILES_MAX_ITEMS no longer have to be a power of two.
• VGM music wave sample fixed (thanks yeon!).
• Animated tiles scene added to regular_bgs and affine_bgs examples.
• bn::core callbacks documentation improved.
• Generic data section added to the import guide.
• How can I show a background with animated tiles? question improved.
• Wonderful Toolchain added to README.md.