ofxGifImage - an updated Gif loader and saver

I’d like to introduce ofxGifImage, it’s an update of the older Gif addons which were kicking around, namely ofxGifDecoder/ofxGifEncoder and ofxGif. These older addons had lots of bugs and didn’t play the majority of gifs from the internet. I’m sure mine’s not perfect, there’s still some file size optimisation to be done and there might be some bugs still, particularly across platforms, but give it a try, it’s loads of fun! I’ve added a camera example in there so you can start making ridiculous gifs immediately.