Partlcle Box need a new attribute

Summary

Particle Box mechanic need a new attribute.

Usage

Particle Box mechanic need a attribute to control the number of selected points.

Value

for example, if i set attribute: amount to 100, this mechanic will shows 100x100=10000 particles, I think it is badly for poorly configured servers

Priority

Add a new attribute in the next dev version, Because the problem is too old.

Implementation

Just add a new attribute for ParticleBox to control the number of selected points.