- 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

locale_template/strings.pot

@@ -498,7 +498,7 @@ msgid "Failed. Select a Geometry Object and try again."
 msgstr ""
 
 #: FlatCAMApp.py:5765 FlatCAMApp.py:5801
-msgid "Expected a FlatCAMGeometry, got"
+msgid "Expected a GeometryObject, got"
 msgstr ""
 
 #: FlatCAMApp.py:5778
@@ -1056,7 +1056,7 @@ msgid "Open TCL script"
 msgstr ""
 
 #: FlatCAMApp.py:10373
-msgid "Executing FlatCAMScript file."
+msgid "Executing ScriptObject file."
 msgstr ""
 
 #: FlatCAMApp.py:10381 FlatCAMApp.py:10384
@@ -15065,7 +15065,7 @@ msgid "Buffer done"
 msgstr ""
 
 #: tclCommands/TclCommandBbox.py:76 tclCommands/TclCommandNregions.py:75
-msgid "Expected FlatCAMGerber or FlatCAMGeometry, got"
+msgid "Expected GerberObject or GeometryObject, got"
 msgstr ""
 
 #: tclCommands/TclCommandBounds.py:67 tclCommands/TclCommandBounds.py:71