Add GodotGifLoader

Added GodotGifLoader, which uses the GodotGif GDExtension GIF Loader to load GIF files.

Library/Helpers/godotgif_loader.gd

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+@icon("res://addons/twitcher/assets/media-loader-icon.svg")
+@tool
+extends NativeImageTransformer
+
+## Godot Addon GIF parser written as GDExtension. Most of the time stable but there 
+## are GIF's that may not work cause the file didn't follow the GIF specification.
+class_name GodotGifTransformer
+
+func is_supported_animation() -> bool:
+	return true
+
+func convert_image(path: String, buffer_in: PackedByteArray, output_path: String) -> SpriteFrames:
+	var tex: SpriteFrames
+	if buffer_in.size() > 0:
+		tex = GifManager.sprite_frames_from_buffer(buffer_in)
+	else:
+		tex = GifManager.sprite_frames_from_file(path)
+	
+	ResourceSaver.save(tex, output_path, ResourceSaver.SaverFlags.FLAG_COMPRESS)
+	tex.take_over_path(path)
+	return tex

Library/Helpers/godotgif_loader.gd.uid

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+uid://cor04lg8wc05p