Introduce a shortcut method to set tab ordering and use it in
the dialogs that override the tab traversal orders:
* Eeschema sheet properties
* Pcbnew Move exact
* Pcbnew Move relative
Also set some initial focus fields in the same dialogs.
Tidy a few includes.
Fixes: lp:1816009
* https://bugs.launchpad.net/kicad/+bug/1816009
John Beard