Add stopcondition attributes to raytrace mechanic

Summary

Add attributes which allow the player to control where a traced ray stops, like options to stop at block, entity, etc.

Usage/Implementation

Identical to the projectile mechanic's stop conditions.

Value

Would allow for more precise control of the ray and enable players to create a piercing/wallbang effect while also taking advantage of raytrace's other attributes, like headshot.

Priority

Medium/High - Could be a simple way to give players a lot of creativity with this mechanic, and even more of an incentive for free users to buy premium.