Fixed myriad bugs with moving field state

[erikras]

Field state moving was all FUBAR. Looking better now.

Fixes #28.

[codecov]

Codecov Report

Merging #35 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #35   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          11     12    +1     
  Lines         147    139    -8     
  Branches       29     29           
=====================================
- Hits          147    139    -8

Impacted Files	Coverage Δ
src/move.js	100% <100%> (ø)	⬆️
src/removeBatch.js	100% <100%> (ø)	⬆️
src/swap.js	100% <100%> (ø)	⬆️
src/moveFieldState.js	100% <100%> (ø)
src/insert.js	100% <100%> (ø)	⬆️
src/remove.js	100% <100%> (ø)	⬆️

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[erikras]

Published in v3.0.1.