Drop all uses of wxRAISED_BORDER and wxSUNKEN_BORDER from dialogs and panels used in main frame windows. Drop use of wxSP_3DSASH options on all wxSplitterWindow definitions. Minor dialog alignment and spacing fixes.
Fixes: lp:1782761 * https://bugs.launchpad.net/kicad/+bug/1782761
Use in-place editing for both. Fixes: lp:1743823 * https://bugs.launchpad.net/kicad/+bug/1743823 (cherry picked from commit 33622cd)