0.1.6

Changes:

• .dat supports OTCv8 'Bones' attribute
• image generators have option 'Enable transparency' (OTC GameSpritesAlphaChannel feature)
• item generator: configurable to use .dat item ID as image ID (no items.otb required) - otservbr support
• tool item-image-frames-to-animated-gif-converter
  • supports APNG (animated PNG format)
  • supports PHP 8.x
  • fixed problem with transparency in animated GIFs (white pixels were 100% transparent)