Luanti ContentDB Mirror

Adds some new player effects:

• Slow down player when walking on snow.
• Speed up player when walking on ice.
• Hurt player when touching cactus.
• Suffocate player when head is inside a solid block.
• Add node check for on_walk_over function.
• Setting to enable old sneak glitch.
• Enable player knockback when hurt (has setting to disable).