Added icons to the draw games

I realised that I forgot to add a 'complete' button to the draw pages and also needed to add a slider and paintbrush icon to the colour picker. I thought a slider would be easier than swatches for a child to use and gives more colour options.

 Initially I has a horizontal slider, but then it was in the way of the finish button...

I was also plying around with the size of the slider, and even though this one is less obtrusive, it is harder to use because it is smaller...
I chose the larger slider for the final because children can have clumsy fingers, it also only appears when picking  colour so i decided that the space it takes up doesn't really matter.