New post-process types added ! + examples !

Hey dear Amstrad users ! I'm very pleased to share with you this new release ! :)

What's new v1.216

[New] Image-To-Amstrad-CPC can now perform complete histogram on colors of the original image to suggest default palette (-palAuto).

[New] Dithered render (fake inner 3 state between each palette color, converted into pattern)

[Fix] Prevent palette to have the same color twice