This implements the UI fader to black card using events and scriptable objects. To use, add a FadeChannelSO to the relevant script, assign the scriptable object, the call either Fade, FadeIn, or FadeOut. Has parameters for duration and target color. This is usable anywhere and at any time, but contains no safeguards besides preventing multiple fades from happening at the same time.
Note: This modifies the PersistentManagers scene and adds an Image UI element that it depends on.