Neon Glowsticks

Added

• Glowsticks glow in your hand: a glowstick held in the main hand or off hand lights up the area around you in its color, so you can walk through a cave with one in hand. Other players and mobs holding a glowstick (a zombie that picked one up, an allay carrying one) light up their surroundings too. Two glowsticks in both hands give two lights.
• Held light is a bit weaker than a thrown stick's (light level 11 by default) and never uses up the stick's glow time. A picked-up stick that was already dimming stays as dim in your hand.
• New client config options: heldLight turns the light of held glowsticks on or off, heldLightLevel sets how bright it is. Held glowsticks count towards maxLights; your own stick always gets a light first.