* Frames moved: cvpcb, cvpcb footprints frame, gerbview, pagelayout editor
This also introduces new EDITOR_CONDITIONS that are used to set the
conditions of very common editor settings.
Also, some IDs were converted to tools in the pagelayout editor.
* Move the preview settings to view and make the menu item work
* Fix bug with preferences menu not displaying on GTK
* Implement quit command and make it similar to the other programs
Fixes: lp:1832139
* https://bugs.launchpad.net/kicad/+bug/1832139