As part of its import updating process, IntelliJ converted some import statements to `import package.{object, _}`. Is this intended to show an explicit dependency on `package.object` and a further dependency on `package` implicits? Unsure. Replace these with `import package._`

# Conflicts:
#	chiselFrontend/src/main/scala/chisel3/Aggregate.scala

This is necessary to support code that imports an implicit conversion
from Int to UInt

Create Chisel IR Port() in a way that Converter is happy with.
Also add more extensive test suite for future-proofing.

Close #1063

Move exceptions up to chisel3 package object - they're part of the interface.

# Conflicts:
#	chiselFrontend/src/main/scala/chisel3/Bits.scala
#	chiselFrontend/src/main/scala/chisel3/Data.scala
#	chiselFrontend/src/main/scala/chisel3/experimental/Annotation.scala
#	chiselFrontend/src/main/scala/chisel3/experimental/StrongEnum.scala
#	chiselFrontend/src/main/scala/chisel3/internal/Builder.scala
#	src/main/scala/chisel3/internal/firrtl/Converter.scala
#	src/main/scala/chisel3/package.scala
#	src/main/scala/chisel3/util/MixedVec.scala
#	src/test/scala/chiselTests/AnnotationNoDedup.scala
#	src/test/scala/chiselTests/Direction.scala
#	src/test/scala/chiselTests/StrongEnum.scala

This causes sbt tasks (run, test, etc.) to fork to a separate JVM to
avoid running out of metaspace. This issue crops up for developers or
users repeatedly running sbt tasks in the same sbt session.

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

- Introduce internal helper `castToInt`, which issues an error when the input
BigInt can't be represented as Int.

- Use `castToInt` wherever we were using `toInt` in a potentially unsafe way.

This is necessary to use ChiselEnum in aggregates where things are
casted using .asTypeOf

Previously, including an empty aggregate in a Bundle would cause
a MixedDirectionAggregateException because it has no elements and thus
doesn't have a direction

* Add SampleElementBinding for Vec sample elements
* Add ActualDirection.Empty for bound empty aggregates

Force clients to access 'DontCare' through the chisel3 package to ensure it's created as a chisel3 object and not a client object.

Discover a working combination of aggregate usage to enable coverage of subproject testing but publish a single Jar.
Use "scalastyle-test-config.xml" for scalastyle config in tests.
Enable "_" in method names and accept method names ending in "_=".
Re-sync scalastyle-test-config.xml with scalastyle-config.xml
This should finally fix #772.

* Turned off strong enum annotations because they weren't working with Vec
indexes
* Add new EnumVecAnnotation for vecs of enums and vecs of bundles with
enum fields
* Changed Clock's width parameter back to a fixed constant value of 1
* Fixed enum annotations for Vecs of Bundles which contain enum elements
* Fixed usage of "when/otherwise" to use consistent style

 and deal with the subsequent fallout.

Move Aggregate, Clock, Mem, Printf, Reg

Move almost all chisel3.core definitions to chisel3 or chisel3.experimental

Revive core package object to provide aliases for moved definitions.

Cleanup package definitions; eliminate ambiguous implicits

Move more definitions to experimental.
Extract BaseModule, DataMirror, ExtModule, IO into their own files.

Add EnumType definition to core package.
Update deprecated messages to refer to correct object

Move FixedPoint into the experimental package (but keep it in Bits.scala).

Add missing implicits to core/package - compatibility

Cleanup: update ScalaDoc references; remove unused imports

Use common 3.2 version in deprecation warning

Move Binding from core to internal.