wxWidgets has several bugs that result in cell editors being closed
right after they're opened. There are two wxWidgets hacks to
partially address this: the SetInSetFocus() hack, and a slow-click
hack. We used to try and work-around these bugs ourselves for
single-click access, but this changelist moves those over to
wxWidget's slow-click hack.
Fixes: lp:1817965
* https://bugs.launchpad.net/kicad/+bug/1817965
Moving pcbnew error strings that may be seen by the user to translated
strings. Strings that denote unexpected cases are moved to debug logs
as they are essentially asserts that should never be shown. The
exceptions are the messages shown when files are loaded. All unknown
items should show an error here.