Quick Summer Keybind Fix — Zone B Korosu Steam update #1081380

- Keybinds should work properly now when using controllers!! - Beefed up keyboard control reliability - Now compatible with Steam Deck (will need to select 'Gamepad With Joystick Trackpad' from the Controller Settings menu)- Fixed an issue with the difficulty scaler - Fixed an issue in Chapter 2 in which zombies could push cars harder than the player, possibly causing softlocks if they pinned the player against a wall - Set player movement to 'running' by default in Chapter 2 Stage 1 - Updated art - Added loads of bg framework to prepare for the All-4-Chapters update