✨ Implement read and write of DSi animated banner icon

[pleonex]

Description

Read and write the animated icon of DSi game banners, including a converter to transform into an animated image of Texim that can be converted into GIF.
Also avoid trying to read the banner if the ROM doesn't have it.

Example

A new node animated is available from the banner node with the animated icon. If the game doesn't contain an animated icon (non-DSi games), then the node is empty. The node contains:

• bitmapX: 8 possible indexed images.
• palettes: palette collection with 8 possible palettes
• animation: animation sequence information. Each frame information points to a bitmap, palette and duration.

A new converter IconAnimation2AnimatedImage is available to convert these nodes into a Texim AnimatedFullImage that can be converted later into GIF.

Related to #8