- 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
- split the FlatCAMObj file into multiple files located in the flatcamObjects folder and renamed the contained classes with names more suggestive
- updated the Google Translation for the German language
- updated the requirements.txt file to request that the Shapely package needs to be at least version 1.7.0 as it is needed in the latest versions of FlatCAM beta
- some TOOD cleanups
- minor changes
- in Excellon UI removed the tools table column for Offset Z and used the UI form parameter
- updated the Excellon Editor to add for each tool a 'data' dictionary
- updated all FlatCAM tools to use the new confirmation message that show if the entered value is within range or outside
- fix for plotting Excellon objects if the color is changed and then the object is moved
- laying the GUI for a new Tool: Punch Gerber Tool which will add holes in the Gerber apertures