UpgradeRestrictor (inspired by DuckSide) - v1.0.0

Description The UpgradeRestrictor plugin prevents players in Rust from skipping upgrade levels for building structures. Inspired by the new game Duckside, which showcases this upgrade progression and is loved by players, this plugin enforces Rust's upgrade sequence: Twig → Wood → Stone → Metal → HQ. It ensures that players follow this order and blocks attempts to skip material tiers. If players try to bypass a step, the upgrade is blocked, and a color-coded message appears in the chat, indicatin...