Experience Beacons for Carpet (XpBeacons)

Changelog

• Beacon "radius", or rather half the side length that makes up the square of a beacon's useful area, is configurable per beacon level
• Effect amplitude is now a minimum of 1, but will still be treated as 0 when applicable for xp drain. This way xp doesn't drain when your xp is low, but you still get a baseline effect.
• xp drain rate is no longer an arbitrary multiplier. xp drain rate is measured in xp points removed per amplitude level
• update README so there's no more HTML formatting issues from curseforge