A Few Improvements - v0.5.0.87

Just a little update, with a few improvements. Couple of new messages, stating that pirates are stealing your resources and now a warning of approaching storm. Also a fix for a possible crash when pirates would be stealing scrap in some circumstances.

That's all in this one, as i've spent a couple of days testing an engine update, which fixes custom music loading, but seems to break Ubuntu builds. So still waiting for a further fix here.

Notes:-

• Improve: Pirate stealing notification added.
  
• Improve: Add a "storm due at x" notification message.
  
• Fix: Pirate grabbing scrap, make sure exists in draw (something else destroyed it).