Unify Windows, Linux, and Mac APIs

[NHDaly]

Currently there are two totally separate interfaces for build_app_bundle, one defined for Mac and one for Windows/Linux.

We should fix that!

I'm going to try to unify them together. For the most part, at first i think this will mostly just entail adding dummy arguments to the windows/linux version so that at least using the same build script on all three systems won't be an Error.