New sphere type from modded ZR

Released in a day after April Fools. This changes adds gray balls/garbage spheres with the behavior described in this Fanon Wiki entry, which makes it more challenging than just an extra color in a Luxor 3 mod or something like that

Notes:

• Right now, garbage spheres worth exactly the same points as normal balls (this may change when more per-sphere properties, especially point multiplier are added)