v0.5.0

Just a medium sized update to Click for Biscuits! this week, but hopefully with some handy features:

• There's a dark mode now! You can toggle between the default theme and the dark theme on the new settings page located under the gear menu
• A bug with research that had been allocated to ... certain tasks ... not being de-allocated when those tasks were complete should now be fixed
• You can now export and import game data from the settings page
• Added a couple of new skills that modify the effectiveness of your cooks
• Added several new recipes and resources
• Adjusted the costs and yields of several existing recipes