Fullbright, Clear Water and better hitboxes

See in the dark without a potion, see through water, and hitboxes that follow F3+B.

• Fullbright: dark places lit as if by day - no potion effect and no gamma change.
• Clear Water: water fog pushed out to your render distance, and no murky overlay under water.
• Hitbox Outline and F3+B are now one switch, and replace the game's white boxes while on.
• Custom Crosshair is drawn in Minecraft's own pixels, with a new Invert Like Vanilla blend.