* Link to Java API Documentation

This adds a build.sbt apiMappings to allow for Scaladoc/Unidoc linking
to Java API documentation. This uses the exact strategy that Scala
upstream uses for linking.

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

* Add example of Java and Scala API docs linking

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

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* Remove toNamed (and friends) deprecation.

* Add inadvertently deleted leading double quote.

* Remove commented out deprecations.

* Explicitly initialize firrtl.stage.Forms to prevent multi-thread collisions
See https://github.com/freechipsproject/firrtl/issues/1462.
Convert `lazy val` members of firrtl.stage.Forms to plan `val`s.
Reference firrtl.stage.Forms in sufficient locations to ensure the object is initialized before its members are accessed.

* Respond to comments - make _dummyForms private.

* Move Forms initialization to package object.

* Merge with master

* Change from log-level debug to trace
* Serialize as JSON rather than .serialize on each annotation

Co-Authored-By: Chick Markley <chick@qrhino.com>

* Pull out common test utilities into a separate package

* Project a fat jar for test utilities

Co-authored-by: Albert Magyar <albert.magyar@gmail.com>

Check for name collisions of Modules

* Fixes #1096

* Fixes #1436

Make InlineInstances invalidate ResolveKinds

Fixes #1453

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

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Introduce Preset Register Specialized Emission
- Introduce EmissionOption trait
- Introduce PresetAnnotation & PresetRegAnnotation
- Enable the collection of Annotations in the Emitter
- Introduce collection mechanism for EmissionOptions in the Emitter
- Add PropagatePresetAnnotation transform to annotate register for emission and clean-up the useless reset tree (no DCE involved)
- Add corresponding tests spec and tester

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

* Fixes #1214

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

- Use Dependency API for transform scheduling
- Add tests that old order/behavior is preserved

Or: "Now you're thinking with dependencies."

Co-authored-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>
Co-authored-by: Albert Magyar <albert.magyar@gmail.com>
Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

Co-authored-by: Albert Magyar <albert.magyar@gmail.com>

* Provide an annotation mix-in that marks RTs as dontTouch

* Update src/main/scala/firrtl/transforms/OptimizationAnnotations.scala

Co-Authored-By: Albert Magyar <albert.magyar@gmail.com>

* Update src/test/scala/firrtlTests/DCETests.scala

Co-Authored-By: Albert Magyar <albert.magyar@gmail.com>

* Update src/main/scala/firrtl/transforms/OptimizationAnnotations.scala

* Update OptimizationAnnotations.scala

Co-authored-by: Albert Magyar <albert.magyar@gmail.com>

Make mergify open backport PRs & signal on failed cherry-picks

* Add firrtl-json serializers

* Added support for ports, info. Added docs and tests

* Avoid IndexOutOfBoundsException when Bits has too few consts

* Check for negative consts in all relevant primops

* Use BigInt for all checks on primop constants

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

Revert inline nots

* Feedback from @jackkoening
* Merge into same stage as Ops to avoid Travis delays

This reverts commit f77487d3.