enhancement: Add % success rate to collision spell effect on the projectile editor

[Gibier1]

Description

It would be a nice edit to allow % success rate to the collision spell option in the projectile editor. This could allow things like an arrow that make the target sometime get bleeding/poisoning/stunning/burning instead of every time.

Intended Use-Case

This would make the combat gameplay less 'boring' so each projectile doesn't seems like a copy-paste.

Duplicate Check

• This enhancement idea is not a duplicate to the best of my knowledge.