Monitorformaladditions

It is the correct config filename. Clearer this way.

Debug APB: Prevent aliasing on undefined addresses

Debug: Fill in holes in APB interface with TLError device

Addition of RV32E and RV64E to rocket core object json

Bump Scala to 2.12.10 and SBT to 1.3.4

[axi4/tilelink] add support to propagate TL to AXI4 user bits

This commits adds the support to propagate the TL user bits to the AXI4
channels if present. Some AXI4 adapter implementations used the AXI4 user
bits to encode routing control bits. The commit pads the TL user bits as
opaque-bits at msb position of the AXI user-field as shown below:

    opaqueBits+userBits-1    userBits userBits-1   0
    +--------------------------------+---------------+
    |           opaque               |      user     |
    +--------------------------------+---------------+

Changes:

  - axi4/Parameters.scala: add opaqueBits parameter to the AXI4MasterPortParameters
  - axi4/Bundles.scala: userBits and opaqueBits to combine user-bits field
  - axi4/UserYanker.scala: support to propagate opaqueBits if present
  - axi4/Test.scala: added a new test that injects TL userbits
  - tilelink/ToAXI4.scala: plumb TL user-bits to AXI4 channels

Incorporate some V extension 0.8 changes

- Added `vlenb` CSR
- Updated encoding of `vadc` and friends
- Removed scaling multiply-accumulates

Convert DM and JTAG to chisel3

Turns out `ValName.toString` prefixed the name with the string "ValName". `ValName.name` is what I wanted and even what I used in the SinkNode already.

Closes #2200

BaseSubsystem: Move attachment function into trait