Automatically set TabStop of OK buttons to 0

...and Cancel buttons to 1.  This should be effective already, due to
manual setting of these values, but occasionally I forget to set
TabStops for new forms.  This ensures that the OK button will always be
the default.

Also, automatically set Cancel button TabStops to 1
Interface overhaul: step 1

All forms now use a copy-and-pasted command button setup for their
OK/Cancel buttons.  This ensures several things:

1) All OK/Cancel buttons are the same size.
2) OK and Cancel buttons all have accelerators set up.
3) OK is always set as "Default" button, and "Cancel" is always set as
"Cancel" (so Esc can be used to trigger it)
4) I have also added a small bit of coloring to distinguish the command
button area from the rest of the forms - important, because:
5) All forms now use the system "window background" color (instead of
previous "button face").  On Windows 7, this means a white background.
Much more modern.