Add unused alien graphics

[quad]

[gardym]

Define 'unused'? Do we want a) new shapes, b) new colours for our participants to incorporate in their games? (I do...)

[quad]

Both A and B— so that people can use these in their own games!

Though, if we put out masks, can we have our painter apply a mask and take a colour parameter?

[distributedlife]

my fork has the other two invader styles if you need them.

[quad]

I do indeed!

What license are you using?

[distributedlife]

I should take the same license that you used as I forked from your project.

[quad]

@gardym has some commits for this:

gardym/testinvaders@e792689c7560291d4da2ae1b292968bbc9bff959 has invader graphics gardym/testinvaders@2a47608cc3d52dacf5d2efc5f3e2623c9c36afe3 has the integration code.