- replaced the testing if instance of FlatCAMObj with testing the obj.kind attribute

- 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

tclCommands/TclCommandJoinExcellon.py

@@ -1,5 +1,5 @@
 from tclCommands.TclCommand import TclCommand
-from FlatCAMObj import FlatCAMExcellon
+from flatcamObjects.FlatCAMExcellon import ExcellonObject
 
 import collections
 
@@ -62,7 +62,7 @@ class TclCommandJoinExcellon(TclCommand):
                 objs.append(obj)
 
         def initialize(obj_, app):
-            FlatCAMExcellon.merge(self, objs, obj_)
+            ExcellonObject.merge(self, objs, obj_)
 
         if objs and len(objs) >= 2:
             self.app.new_object("excellon", outname, initialize, plot=False)