firtool-1.95.0 release

- This adds the ability for private FIRRTL modules to deduplicate with
  public modules.
- A LowerTypes performance improvement.
- An LLVM bump.
- Additional checking that Grand Central companion modules are not mixed
  with layerblocks (or vice versa).
- Infrastructure working towards inline unit tests.
- A change to treat uninstantiated modules as being in the "effective"
  design.