Xcode: Reference files by absolute path, and name them by basename only

Xcode uses project and group relative file paths, but to keep things
simple for ourselves we use absolute paths everywhere. We now make an
effort to actually make these paths absolute before telling Xcode they
are.

We also make the visual representation of the files inside Xcode be
just the filename, not the full path, like Xcode itself does. This
is among other things a prerequisite for Xcode to stop complaining
about missing launch images for retina 4-inch screens.

Change-Id: I5ff6bf07f61888e3c9fe2f64cbc2beb896b8442d
Reviewed-by: Andy Shaw <andy.shaw@digia.com>

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