EA-1.31 Halloween Update

What's new?
- Some cities are now feasting for haloween and a strange spirit can be seen in the sky.
- The game menu has been completely remade with a different approach and a more modern experience.
- Enable and disable buttons are now replaced by checkboxes.
- The game will now ask confirmation before overriding a save.
- The game will now ask confirmation before quitting the game.
- The game will now ask confirmation before restarting the game.
- The game will now ask confirmation before loading a save.
- The game is now paused when the game menu is opened. This is still experimental so please don't hesitate to report issues if something is not paused properly.
- New factories models.
Bug fixes
- Humans are now only looking for primary resources.
- Multi Terrain option is now disabled when the game loads or the option is no longer available to the player due to his deity level.
- Non terrain miracles no longer cost more when the multi terrain option is activated