Adding gif and sprite animation examples.

[Palessan]

-Added new UpdateTextureUnsafe method to support it.

[gen2brain]

There is no need for a new custom function, just use unsafe.Slice((*color.RGBA)(unsafe.Pointer(uintptr(imScarfyAnim.Data)+uintptr(nextFrameDataOffset))), SIZE).

[gen2brain]

Btw. there is already https://github.com/gen2brain/raylib-go/tree/master/examples/textures/rectangle example, looks the same, maybe just it was renamed?

[Palessan]

Btw. there is already https://github.com/gen2brain/raylib-go/tree/master/examples/textures/rectangle example, looks the same, maybe just it was renamed?

oh! then i'll remove mine and rename existing one as per original example name in raylib

[Palessan]

done

[gen2brain]

Is texScarfyAnimSize only width*height, looks like it is missing * 4?

[gen2brain]

Yeah, it actually should be like that, divided by 4, or not multiplied.

[gen2brain]

Merged, thanks!

[Palessan]

This was my first open source contribution!
Transferring my old pet game from XNA to raylib-go while learning Go : )