Version 0.5a - Patch Release

Big patch update. Put a lot of work into fixing all the bugs. Hopefully I've caught them all now. Please let me know if I've missed any. Its late and I'm really tired so I'm not going to note all the fixes - they're in the in-game change log anyway. You may notice the file size is around 10MB smaller than the unpatched version - that's down to me originally forgetting to resize a lot of the new background images (and accidently including some of the older original artwork out of the resources folder and they all render at 1024x1024 and I need to rescale them.)