- 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)

appObjects/AppObjectTemplate.py

@@ -536,7 +536,7 @@ class FlatCAMObj(QtCore.QObject):
         font = QtGui.QFont()
         font.setBold(True)
 
-        p_color = QtGui.QColor("#000000") if self.app.options['global_theme'] == 'light' \
+        p_color = QtGui.QColor("#000000") if self.app.options['global_theme'] in ['default', 'light'] \
             else QtGui.QColor("#FFFFFF")
 
         # main Items categories

appObjects/GerberObject.py

@@ -988,7 +988,7 @@ class GerberObject(FlatCAMObj, Gerber):
                     used_color = random_color() if self.obj_options['multicolored'] else 'black'
                     used_face_color = None
 
-                if self.app.options["gerber_plot_line_disable"] is True:
+                if self.app.options["gerber_plot_line_enable"] is False:
                     used_color = None
                 if isinstance(plot_geometry, (Polygon, LineString)):
                     self.add_shape(shape=plot_geometry, color=used_color, face_color=used_face_color, visible=visible)