Fix edge case with patch/reset. Add dispatch optimization.

[nhunzaker]

Adds two fixes/optimizations:

[microcosm] Patch and Reset only trigger on complete

This commit fixes a bug where patch and reset would trigger on every state update. I only noticed this after doing some work on a scheduler for Microcosm, which has some improvements in error handling.

[microcosm] Do not process actions that are only started

This commit commit adds an optimization to domain dispatch that prevents the ledger from assigning state for actions that have only started, but have no progress.

[codecov-io]

Codecov Report

Merging #508 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #508      +/-   ##
==========================================
+ Coverage   99.69%   99.69%   +<.01%     
==========================================
  Files          27       27              
  Lines         659      665       +6     
  Branches      130      131       +1     
==========================================
+ Hits          657      663       +6     
  Misses          2        2

Impacted Files	Coverage Δ
packages/microcosm/src/domain.js	100% <100%> (ø)	:arrow_up:

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[nhunzaker]

Thanks, @zporter!