- in Tools Database added a Save Button whose color is changed in Red if the DB was modified and back to default when the DB is saved.
- fixed bug in Tool DB that crashed the app when the Tool Name was modified but there was no tree item (a tool in the list) selected in the Tree widget (list of tools)
- now on tool add and tool copy, the last item (tool, which is the one added) is autoselected; o tool delete always the first item (tool) is selected
- removed the import of the whole FlatCAMApp file only for the usage of GracefulException
- remove the import of FlatCAMApp and used alternate ways
- optimized the imports in some files
- moved the Bookmarksmanager and ToolDB classes into their own files
- solved some bugs that were not so visible in the Editors and HPGL parser