Make MMTitlebarAppearsTransparent option work on pre-Mojave #917
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Added the special path to make tranparent titlebars work on pre-Mojave builds as well. It's annoying we have to two maintain separate code paths for how windows / titlebars work but this wasn't too hard to add. We just need to make sure to to set the background color on the window only when we have transparent titlebar set. Otherwise we don't want to do it because of weird interactions with textured window flag.
This addresses comments made in #888.