Mac: Miscellaneous container/listox fixes. Add a single pixel to the column width during optimization, to prevent cases of abbreviating the column. During _cont_new() which is used by both containers and listboxes force the striping to be disabled initially. Automatically optimize the column sizes of listboxes when adding or deleting contents.

# Set these here to change the version for all platforms
DW_MAJOR_VERSION=3
DW_MINOR_VERSION=0