New Features:
- Stage numbers are optionally shown in hex (must be activated in Settings)

Bug fixes:
- When leaving the hero screen, the current hero is de-selected. Fixes issue #206.
- Coins in the hero screen are no longer shown separately if there are too many of them. Fixes issue #208.
- If an attacker becomes released from ACC or MEM during its fade-out animation, it no longer disappears. Fixes issue #212.

