Resolve "Add Aperture to each port of an optical element"

Closes #118 (closed)

examples/simple_for_talk.rs

+use nalgebra::Point2;
+use opossum::aperture::{Aperture, CircleConfig};
 use opossum::error::OpossumError;
+use opossum::lightdata::{DataEnergy, LightData};
 use opossum::nodes::{Dummy, EnergyMeter, Source};
+use opossum::optical::Optical;
+use opossum::spectrum::create_he_ne_spectrum;
 use opossum::OpticScenery;
 use std::path::Path;
 
 fn main() -> Result<(), OpossumError> {
     let mut scenery = OpticScenery::new();
     scenery.set_description("OpticScenery demo");
-    let node1 = scenery.add_node(Source::default());
-    let node2 = scenery.add_node(Dummy::new("optic"));
+    let node1 = scenery.add_node(Source::new(
+        "Source",
+        LightData::Energy(DataEnergy {
+            spectrum: create_he_ne_spectrum(1.0),
+        }),
+    ));
+    let mut dummy = Dummy::new("optic");
+    dummy.set_input_aperture(
+        "front",
+        Aperture::BinaryCircle(CircleConfig::new(1.5, Point2::new(1.0, 1.0))?),
+    )?;
+    let node2 = scenery.add_node(dummy);
     let node3 = scenery.add_node(EnergyMeter::default());
     scenery.connect_nodes(node1, "out1", node2, "front")?;
     scenery.connect_nodes(node2, "rear", node3, "in1")?;