v1.1 update - added pure white versions, fixed bugs

As requested by MelPeslier, I added pure white versions on transparent background (found in the new folder called 'Transparent Versions White Only') and fixed some issue with tiling of snow 1,  space pebbles 1 & 2, rain 1 & 2. Also fixed a small bug with space scrap 1 & 2.

Let me know if I missed anything else. 

I am planning on a major overhaul of this pack in the future, but I don't have a timeframe for it yet, currently very busy.