HM3: PNG and JPG fix

I think I've fixed the HM3 Alpha problem where using "Save as JPG/PNG" would squeeze your character into the upper left corner of the image if you used the left or right Hand. It now sets the image size to 400x600, which means wingtips and such will get cut off. But, it returns those features to basic usability, at least.

It also hopefully sets the stage for the "choose super big size" option down the road. In fact, I think I can by default set it to larger than 400x600 if you guys want, just let me know. This is all uncharted territory, I'm just hacking my way through it, but I'll give it a whirl.