Added entity:setSubMaterial and entity:getMaterials
Added entity:setSubMaterial and entity:getMaterials

entity():setSubMaterial( number, string ) will allow you to change the sub materials on props that allow it.
entity():getMaterials() returns an array of all of the materials on a prop.

Cost for setSubMaterial is set to the normal setMaterial of 10, but the getMaterials cost is set to 20.
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