Added 3 spritesheets for character animation

[Raketfart]

As mentioned in issue #142 these spritesheets are for character animation

[Raketfart]

These files are for first stab at character animation.
The xml file has tile information. Theres an idle south east and north facing character, as well as a 2-step walking animation for south, east and north. West facing could hopefully be flipped in the animation script.

Here is a preview.

Also added is the character without helmet, and a spritsheet with only the helmet. Tile sizes are all the same.

[Raketfart]

Oh, and these are of course just modified versions of kenney.nl's spaceman, same as the original

[dustinwloring1988]

This should be a nice touch.

[Tranberry]

For us who can't visualize as good. (wrong fps).

[bjubes]

Make sure to open in unity and add the generated meta files.

[Raketfart]

Done, thanks

[Tranberry]

@vogonistic @WardBenjamin @RodRitter - any input?

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#266 will conflict with this if not in code but in art. :/

[WardBenjamin]

Looks good to me! I think the changes in #266 would be reasonably easy to modify so that they work with this animation system, and this looks great. Thanks!

(Waiting for @vogonistic or @RodRitter's input before merging)

[andreas-becker-98]

It should be pretty easy to combine. The only changes I have really made were adding the helmet to a separate sprite and changing the character colour to white.