Update protomatter

This brings in the following, and updates us to the 1.0.4 release tag:

Submodule lib/protomatter 2a1ba8fa4..5f07ec618:
  > Bumping version for release
  > Merge pull request #21 from makermelissa/master
  > Merge pull request #20 from makermelissa/master
  > Merge pull request #18 from jepler/fix-cpy-3184
  > Merge pull request #14 from hierophect/cpy-timer-allocator

We previously had the _changes_ of jepler/fix-cpy-3184 and
hierophect/cpy-timer-allocator but not their merge commits.

The only other changes in protomatter were one formatting change in the
core, plus several Arduino sketches.  So this should make no practical
difference for CPy.

Author: jepler