Slot Machine (Board 20):
- Takes more damage in the opening rounds
- Has a slightly later final "enrage"
- Has slightly slower reels
- Has a slightly reduced Kill Paddle frequency whenever the symbols don't match
- Is now correctly defeated whenever a Zap Bricks would remove its last 1 HP

The rest of the set:
- Received consistency-related fixes, ensuring that variables are saved correctly

- Sunburst (13); switches are now sticky
- Centipede (17); centipede movement no longer erases "mushrooms" and exploding bricks. Mushrooms now spawn instantly upon destroying a segment
- Slot Machine (20); switches are extra sticky; only flipping at the beginning of a fresh round

Nerf the Slot Machine level modestly. It was a massive difficulty spike, capable of ending entire games on its own accord.

Switch handling transitioned to "onHitButton".

Fix Keybreak (11)'s softlock guard system

Hotfix: Correctly reset the movement speed to default upon losing a life. (multiple levels affected)

Fixed save system-related bugs