- changed the way a new FlatCAMScript object is made, the method that is processing the Tcl commands when the Run button is clicked is moved to the FlatCAMObj.FlatCAMScript() class
- reused the Multiprocessing Pool declared in the App for the ToolRulesCheck() class
- adapted the Project context menu for the new types of FLatCAM objects
- modified the setup_recent_files to accommodate the new FlatCAM objects
- made sure that when an FlatCAM script object is deleted, it's associated Tab is closed
- created a new class that holds all the Code Editor functionality and integrated as a Editor in FlatCAM, the location is in flatcamEditors folder
- remade all the functions for view_source, scripts and view_code to use the new TextEditor class; now all the Code Editor tabs are being kept alive, before only one could be in an open state
