Hyperspace Booster Cooldown (2.0 compatible)

Modifies Hyperspace Booster to have much lower cooldowns the higher its rarity is. Original formula adds base cooldown reduction linearly based on upgrade rarity (~7. 5 - 20% base reduction): cooldown reduction % = 5 + (rarity + 1) 2. 5 New formula adds base cooldown reduction with quadratic growth (~8 - 81% base reduction): cooldown reduction % = 5 + (rarity rarity + 1) * 3 This means that higher rarity upgrades can have much higher cooldown reduction than more common ones.