* Cleanup Cookbook and printing docs
* Format specifiers are actually concise now

Co-authored-by: Megan Wachs <megan@sifive.com>

Referenced to: chipsalliance/chisel3#2728

Add macro for determining Chisel structural subtypes. This replaces the                                                                                                                                                       
use of built-in <:< for determining what types can be cast with
.viewAsSuperType.

Co-authored-by: Jack Koenig <koenig@sifive.com>

Mem.read is combinational and thus unaffected by the clock, and so it
does not make sense to issue warnings about the current clock in this
context.

This reverts commit de76e70b.

- Remove line defeating having wire locators
  `implicit val noSourceInfo = UnlocatableSourceInfo` from `WireDefault#apply`
- Add test to show locators

We need to ensure that contextual names stay contextual (ie. sensitive
to the module context which is important for naming ports).

Also make the specified version more human readable for easier bumping
in the future.

Co-authored-by: Jack Koenig <jack.koenig3@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Co-authored-by: Adam Izraelevitz <adam.izraelevitz@sifive.com>

* Add a cookbook and publicly visible scaladoc for prefix, noPrefix

Fix Record cloneTypes.

Add support for printable within assert and assume verification statements

Co-authored-by: Girish Pai <girish.pai@sifive.com>
Co-authored-by: Megan Wachs <megan@sifive.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>

OpaqueTypes are essentially type aliases that hide the underlying type.
They are implemented in Chisel as Records of a single, unnamed element
where the wrapping Record does not exist in the emitted FIRRTL.

Co-authored-by: Jack Koenig <koenig@sifive.com>

Add --warnings-as-errors option

Co-authored-by: Jack Koenig <koenig@sifive.com>

Upstream sifive/chisel-circt.

Or: now we're cooking with MLIR.

Use the published Ubuntu 20.04 binary of CIRCT to enable chisel-circt
tests in CI.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Move the git-subtree added sifive/chisel-circt repository from "circt/"
into "src/main/scala/circt/" and "src/test/scala/circtTests/".  Update
the chisel-circt README, which now lives in the src directory, to not
indicate that this is a published dependency anymore.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

git-subtree-dir: circt
git-subtree-mainline: 0b2c211b
git-subtree-split: 7dd9f0e9

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

- Fix handling of EmitAllModulesAnnotation
- Fix stderr handling/erroring out if firtool errors during compile

Change GitHub CI to use a tagged, published Ubuntu binary of CIRCT
instead of relying on a nightly docker image.  This is both: (1) more
stable and (2) way faster.  This also removes a barrier to upstreaming
chisel-circt with chisel3.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

We no longer meet on Tuesdays, only Mondays.