- updated the Milling Plugin and all the related parts in the CNCJob Object and in all preprocessors. Now, the parent 'tools' attribute is inherited and also the GCode is stored here

- made sure that old projects load but without the CNCjob objects which would have crashed the app due different data structures
- the FlatCAm Evo projects load now in succession, no longer on threads

appPlugins/ToolSolderPaste.py

@@ -930,7 +930,8 @@ class SolderPaste(AppTool):
             # this turn on the FlatCAMCNCJob plot for multiple tools
             new_obj.multitool = True
             new_obj.multigeo = True
-            new_obj.cnc_tools.clear()
+            # new_obj object is a CNCJob object made from an Geometry object
+            new_obj.tools.clear()
             new_obj.special_group = 'solder_paste_tool'
 
             new_obj.options['xmin'] = xmin
@@ -970,7 +971,8 @@ class SolderPaste(AppTool):
 
                 # tell gcode_parse from which point to start drawing the lines depending on what kind of
                 # object is the source of gcode
-                new_obj.cnc_tools.update({
+                # new_obj is a CNCJob made from Geometry object
+                new_obj.tools.update({
                     tooluid_key: deepcopy(tool_cnc_dict)
                 })
                 tool_cnc_dict.clear()
@@ -1031,13 +1033,14 @@ class SolderPaste(AppTool):
         gcode += '(Units: ' + self.units.upper() + ')\n' + "\n"
         gcode += '(Created on ' + time_str + ')\n' + '\n'
 
-        for tool in obj.cnc_tools:
+        # obj is a CNCJob object made from an Geometry object
+        for tool in obj.tools:
             try:
                 # it's text
-                gcode += obj.cnc_tools[tool]['gcode']
+                gcode += obj.tools[tool]['gcode']
             except TypeError:
                 # it's StringIO
-                gcode += obj.cnc_tools[tool]['gcode'].getvalue()
+                gcode += obj.tools[tool]['gcode'].getvalue()
 
         # then append the text from GCode to the text editor
         # try:
@@ -1101,8 +1104,9 @@ class SolderPaste(AppTool):
         gcode += '(Units: ' + self.units.upper() + ')\n' + "\n"
         gcode += '(Created on ' + time_str + ')\n' + '\n'
 
-        for tool in obj.cnc_tools:
-            gcode += obj.cnc_tools[tool]['gcode']
+        # for CNCJob objects made from Gerber or Geometry objects
+        for tool in obj.tools:
+            gcode += obj.tools[tool]['gcode']
         lines = StringIO(gcode)
 
         # ## Write