put all validators behind a single module name

…led!

unboxing it fixed our lifetime problems

and it looks SO MUCH NICER dont you think??

one less clone is good

cant support these till we make an allocation protocol

…dl successfully!

and eliminate a ton of clones as a result

This prevents resources like embedder contexts or heap views from living across yield points, which
is important for safety since the host can modify the data underlying those resources while the
instance is suspended.

Since this is a semver breaking change, this patch also updates the package versions.

Make yield methods take `&mut Vmctx`; update semver

Fixes #276 - Allow use of aligned heaps

add blank rustfmt config file

This was previously accepted by the compiler but is being phased out;
it will become a hard error in a future rustc release.

See rust-lang/rust#66145
>

The benchmark and fuzz targets in particular take quite a long time to run, and are usually not the
focus of development. They're still worth running in CI, though, to catch bitrot.

Switch back to stable, make local `make test` target cheaper

clean up `symbol_data` control flow

move lucet-module bindings tests

* Addresses two lint warnings about redundant field names, using the shorthand notation instead.
* Moves `*_name_for` helper functions nested inside of `declare_funcs` out of a loop body. This is just a small readability fix for our loop.

Currently, `lucetc` assumes that the machine that it's compiling
for (the "target") is the same as the machine on which `lucetc` is
running ("the host").  While this is a reasonable assumption to make,
many future uses of `lucetc` may require these machines to be distinct.
Towards that end, let's introduce a `--target` option for specifying the
machine `lucetc` is supposed to be generating code for, and thread that
information through to all the places that require it.

It was already possible to use via the `Instance::kill_switch()` method, but couldn't be named in a
type signature or a type declaration.

Export the `KillSwitch` type from the public runtime API

replace empty constructor w/ default impl

add optional target specification to CpuFeatures

Co-authored-by: Pat Hickey <pat@moreproductive.org>

Most of our thinking about semver for this project is concerned with the more "public-facing" crates
like `lucetc`, `lucet-runtime`, and `lucet-wasi`, as opposed to "implementation detail" crates like
`lucet-module`, `lucet-runtime-internals`, etc. As the project matures, we are paying more attention
to semver for all of the crates, but this change makes the released sets of packages more
consistent.

#399)

Use exact dependencies for crates within the repo