- fixed the Tcl Command AlignDrillGrid
- fixed the Tcl COmmand Panelize, Excellon panelization section
- Fixed an issue in Tool Calibration export_excellon method call
- PEP8 corrections all over the app
- modified the Properties Tab for various FlatCAM objects preparing the move of Properties Tool data into the Properties Tab
- if the Properties tab is in focus (selected) when a new object is created then it is automatically selected therefore it's properties will be populated
- fixed the issue with factory_defaults being saved every time the app start
- fixed the preferences not being saved to a file when the Save button is pressed in Edit -> Preferences
- fixed and updated the Transform Tools in the Editors