Update project to be able to build with Xcode 15

[faisal]

A number of changes in support of being able to build with the current Xcode:

• Set all targets' build version, marketing version, and swift version to inherit from the project. With the minimum deployment target of 10.15 and use of Swift 5, Xcode no longer bundles Swift libraries in the built app for backwards compatibility, which cuts the resulting app size by ~90%.
• Stopped manually embedding the Clean_Links entitlement

[faisal]

This is largely ready, but it builds on https://github.com/Sh1d0w/clean-links/pull/28 and we should wait for that to land before landing this one.