XP: Attribute Core

This version fixes a couple of effects, but live monitoring will be necessary to improve its optimization.

Arrow Rain

• The Arrow Rain effect has been completely modified.
• It now works with any type of projectile.
• The arrow rain is an area-of-effect attack.
• Damage is correctly attributed to the player in DPS counters.
• The effect no longer has a 3-level limit.
• Each level increases arrow damage.

Builders Flight

• The vertical flight area has been increased.