Using Title + Message wasn't working for all the dialogs which
did substitutions in the message (which was a lot of them).
Fixes: lp:1789348
* https://bugs.launchpad.net/kicad/+bug/1789348
This also fixes a bunch of bugs where an error during save would
still close the window (rather than cancelling the close action).
Fixes: lp:1785034
* https://bugs.launchpad.net/kicad/+bug/1785034
Put the buttons in platform-compliant order.
Get rid of SaveMultiOptions in favour of repeated standard save
dialogs with a "Apply to all" checkbox.
Fixes: lp:1783444
* https://bugs.launchpad.net/kicad/+bug/1783444
* Create a generic yes/no/cancel dialog from DIALOG_EXIT.
* Make DIALOG_EXIT return wxID_YES instead of wxID_OK so it is consistent
with the standard message dialogs.
* Add missing license to confirm.h and confirm.cpp.
* Change Eeschema message dialog when loading a schematic if the current
schematic is modified to be more consistent with the exit dialog.
* Change Pcbnew message dialog when loading a board if the current board
is modified to be more consistent with the exit dialog.
* Remove some Eeschema block debug logging code left over from my last
commit.
* Use version of DateAndTime that returns a wxString and delete the
version that takes a char* as it is no longer required.
* Merge StrNumICmp() and StrLenNumICmp() into StrLenNumCmp() to create a
single function for comparing strings with integers and remove a lot
of duplicate code.
* Remove unused strupper from string.cpp.
* Use wxArrayString for sorting the EDA_LIST_DIALOG contents.