abspath doesn't cope very well with paths that contain spaces, even if
those spaces are escaped.

Xcode 14 has minimum deployment targets of macos 10.13 and iOS 11.

Mirrors the behaviour of CMake by only adding signing identity field to
project when identity is not empty.

This includes Carbon support

This more closely matches the behaviour of CMake when adding rc files to
targets.

This also fixes an issue where the requested font style could be
incorrectly overwritten.

This more closely matches the behaviour of CMake when adding rc files to
targets.

applicationId