- fixed some leftovers due of recent changes in the theme management

- added a new feature (new modules are required) in the Image Plugin (Menu -> File -> Import -> Import Image) that allow tracing images. This may allow engraving pictures.
- started to add UI's for the Excellon Editor Tools (really early work)

setup_ubuntu.sh

@@ -49,6 +49,8 @@ sudo -H python3 -m pip install --upgrade \
 	pikepdf \
 	foronoi \
 	ortools \
-	pyqtdarktheme
+	pyqtdarktheme \
+	darkdetect \
+	svgtrace
 # OR-TOOLS package is now optional
 # ################################