This allows an ARM64 swift-inspect to correctly read from an ARM64e target process. We compute a ptrauth mask by stripping all bits above MACH_VM_MAX_ADDRESS. This strips more than we strictly need, but it works.
This restructures and refactors the project to split up the
implementation into smaller fragments. The majority of the operations
are portable: the ones which are not require iterating the heap
allocations which is not guaranteed to be a portable operation.
Additionally, the `Inspector` class is renamed into `RemoteProcess`
which is also converted to a protocol to allow adding in an
implementation for other targets. The inspection operations are split
off into individual files to make it easier to follow. Take the
opportunity to use `@main` for the entry point.
