add translucency to outlineColor

fix for #8553

PR adds translucency to outlineColor in BillboardCollectionVS
update contributors to include Geoplex GIS GmbH members

Author: LHolst

CONTRIBUTORS.md

@@ -154,6 +154,9 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
   - [Jonathan Nogueira](https://github.com/LuminousPath)
 - [Palantir Technologies, Inc.](https://palantir.com)
   - [Joey Rafidi](https://github.com/jrafidi)
+- [Geoplex GIS GmbH](https://www.geoplex.de)
+  - [Hannes Gräuler](https://github.com/lordi)
+  - [Leonard Holst](https://github.com/LHolst)
 
 ## [Individual CLA](Documentation/Contributors/CLAs/individual-contributor-license-agreement-v1.0.pdf)
 

Source/Shaders/BillboardCollectionVS.glsl

@@ -423,6 +423,7 @@ if (lengthSq < disableDepthTestDistance) {
 
     v_outlineWidth = outlineWidth / 255.0;
     v_outlineColor = outlineColor;
+    v_outlineColor.a *= translucency;
 #endif
 
     v_pickColor = pickColor;