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

* Update scalacheck-1-14, ... to 3.1.4.0

* Update scalacheck-1-14, ... to 3.1.4.0

* Update scalacheck-1-14 to 3.1.4.0

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* Add test to check ShiftRegister(s) with delay is 0.

This should break ShiftRegister(x, 0) since last is not exist in a empty
Seq. Originally, test only test 1 to 4, which missed a potential bug
from #1723.

* Fix ShiftRegister with 0 delay.

if ShiftRegisters is empty, java will complain:
```
  java.util.NoSuchElementException
    scala.collection.LinearSeqOptimized.last(LinearSeqOptimized.scala:150)
```
This fix this issue and return `in` directly when ShiftRegister size is 0.

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

Co-authored-by: Jiuyang Liu <liu@jiuyang.me>

* add ShiftRegisters to expose register inside ShiftRegister.

* use Seq.iter for oneline implementation.

* add convert(chirrtl: cir.Circuit): fir.Circuit to convert chirrtl to firrtl.

* add scaladoc.

* add test.

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Co-authored-by: Jiuyang Liu <liu@jiuyang.me>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Co-authored-by: Jiuyang Liu <liu@jiuyang.me>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Co-authored-by: Jiuyang Liu <liu@jiuyang.me>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Co-authored-by: Jiuyang Liu <liu@jiuyang.me>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

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* Cookbook: clean up desiredName example

* Update cookbook.md

This PR provides for support for Vec literals. They can be one of two forms
Inferred:
```
Vec.Lit(0x1.U, 0x2.U)
```
or explicit:
```
Vec(2, UInt(4.W)).Lit(0 -> 0x1.U, 1 -> 0x2.U)
```
- Explicit form allows for partial, or sparse, literals.
- Vec literals can be used as Register initializers
- Arbitrary nesting (consistent with type constraints is allowed)

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nitpick

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Using https://github.com/ucb-bar/chisel-repo-tools/pull/31

* Remove space between backticks and language
* Make code examples in memories explanation work

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

* Add documentation guide about memory initialization

* Move information to experimental and add ref

* Add CCC2021 info

* Update README.md

* Update README.md

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