Things relating to pinout images

[SpenceKonde]

Discovered what I'd uploaded had too much whitespace, but by then github was caching it, so had to upload both fixed copy, and one with new name to fool the cache.

Remember to remove one with altered name before next release - cache will have updated by then.

Also, FFS, the images need to be pulled from future board manager releases. There is no need to make people download 30MB of high-res images that will be hidden in a not-meant-to-be-used-by-humans Arduino15 folder...