RenderMesh never updates again after first migration from LineStyle

[5argon]

LineStyle SCD provide a way to give RenderMesh the material you want to use but currently if you update the material in LineStyle to a new one, it would never be updated to RenderMesh again.

[andrew-raphael-lukasik]

I've made a sketch for a system to deal with this LineStyleUpdateSystem (part of this PR)

It's under-optimal (high-cpu usage), so I made it execute from manual ticks only for now. Hope someone will have an idea for how to improve it