Update dependencies, including goblin 0.15.

Several fields in goblin changed type, so change faerie's code
accordingly.

goblin and scroll have API changes, so I'll update them separately.

This fixes the handling of custom targets.

Port faerie to the target-lexicon crate.

This allows the binary format to be specified after an artifact is
populated, rather than before.

`targeting` is a new crate that provides a vocabulary for describing targets,
including their ar...

Change relocations in data sections to be absolute and pointer-sized

and fix `pub use` goof

upcoming changes needs this

update env_logger to 0.5.8

Use asserts to check that emitted sizes are as expected.

Use `write_all` instead of `write`.

Fix handling of ELF file symbols.

`write` isn't guaranteed to write all of the bytes; it returns a size
saying how many bytes are ...

Check that computed sizes for various ELF constructs are the size
they are expected to be with `...

This fixes `new_string` to handle the case where the string is already
present in the string tab...

Ensure all artifact symbols are defined before emitting object

this makes the search for undefined declarations O(n) and allows us to
reject duplicate definiti...

this particular should_panic test isnt guilty of it, but in the case of
others it wasnt clear wh...

switch from outdated ordermap crate to indexmap 1.0.0

ordermap and its types were renamed to indexmap for the 1.0.0 release.
aside from s/Order/Index,...

Add clone derivations; elaborate linking error

I believe this is harmless.

Make import(...) really just sugar for declare(...)

This removes adding the import to Artifact::imports twice. It's
already handled by declare.

First cut at specializing data decls/defns

- Adds a new datum to `Data` that determines whether the corresponding ELF section should have t...

Add `Artifact::link_with` API to optionally override ELF relocation type

link_with allows you to provide a RelocOverride

* Add Definition
* Add single definition vector
* implement local values for functions and strin...

* Adds new Link { from, to, at } api for adding links
* Add ImportKind for imports, with Functio...

The write function iterates through self.relocations to write the
sections to the output file, s...

Make sections other than text and data non-alloc.

These are the names specified in the SysV ELF ABI.

This is an empty and non-allocated section which tells some popular ELF
implementations that th...