Workspaces can't find source files

[armcknight]

There are a couple workspaces like iOS.xcworkspace etc that have broken paths to source files after what looks like several reorganizations of the file structure:

It looks like opening from the Package.swift is the preferred way to write code here now; either those old xcworkspaces should be removed, or have the broken paths fixed.

[GLinnik21]

Duplicates #495

[GLinnik21]

I'll clean up the project soon and remove the old project files.

[bamx23]

@armcknight does it break the KSCrash as a library? As I can imagine it can break Carthage, but I don't think we're supporting it as a way to districbute KSCrash.

And yes, we are planning to rework the samples setup and cleanup things.