For the sake of consistency across all dialogs and window that behave
like dialogs, remove the static line that separates the main part of
the dialog from the standard buttons. This only applies to windows
that have the standard button on the bottom of the frame.
This covers the 3D viewer, CvPcb, common, GerbView and KiCad dialogs.
- When loading a file from history the users was always asked to discard changes.
- Bitmap items: the PPI setting was not displayed.
- Text items: the PPI setting was displayed.
- Poly items: the Rotation option was not displayed.
Improve dialog layout and fix UI policy issues with all of the dialog
boxes in the Gerbview and Pcbnew code paths.
Updated the use of component to footprint where appropriate.
