std.debug: rename Info to SelfInfo

This code has the hard-coded goal of supporting the executable's own
debug information and makes design choices along that goal, such as
memory-mapping the inputs, using dl_iterate_phdr, and doing conditional
compilation on the host target.

A more general-purpose implementation of debug information may be able
to share code with this, but there are some fundamental
incompatibilities. For example, the "SelfInfo" implementation wants to
avoid bloating the binary with PDB on POSIX systems, and likewise DWARF
on Windows systems, while a general-purpose implementation needs to
support both PDB and DWARF from the same binary. It might, for example,
inspect the debug information from a cross-compiled binary.

`SourceLocation` now lives at `std.debug.SourceLocation` and is
documented.

Deprecate `std.debug.runtime_safety` because it returns the optimization
mode of the standard library, when the caller probably wants to use the
optimization mode of their own module.

`std.pdb.Pdb` is moved to `std.debug.Pdb`, mirroring the recent
extraction of `std.debug.Dwarf` from `std.dwarf`.

I have no idea why we have both Module (with a Windows-specific
definition) and WindowsModule. I left some passive aggressive doc
comments to express my frustration.

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