Power meter

[Lyonnard]

Add a block that measure the power in a specific point.
there could be two versions of it:

1. Real: measure only the power = magnitude squared and completely blocks the light to where it is connected
2. Ideal: measure power, field and phase, also lets all the light go through without changing any property

[aignermax]

Hi @Lyonnard
thank you very much for your contribution, that sounds like a very good idea!

We haved worked on your idea for the last days and got the powermeters on the left side to work so they now display the power of the given color from 0 to 1

We are also working on a powermeter-tool that can calso display phase and field for each attached color of the light as we also think it is a very good idea to have that. However we will have to change a lot of the underlying structure as we have to create a tooling system for that, but that might be needed anyway. :)