Added will-change: transform to prevent repaints on scroll

[Vanderslice]

• Added will-change: transform to table-container to prevent repaints when scrolling the grid in Chrome, Firefox, and Opera. This change causes slightly more memory usage but provides smoother scrolling with a large number of records; was maintaining 60fps with 2,000 records.

• We could look at adding something like "transform: translateZ(0)" to help with Safari but it's not really a proper usage

• Fixed an existing linting error

[codecov-io]

Codecov Report

Merging #159 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #159   +/-   ##
=======================================
  Coverage   76.83%   76.83%           
=======================================
  Files         112      112           
  Lines        4558     4558           
  Branches      277      277           
=======================================
  Hits         3502     3502           
  Misses        846      846           
  Partials      210      210

Impacted Files	Coverage Δ
src/util/stateGetter.js	89.28% <100%> (ø)	⬆️

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[bencripps]

Awesome, thanks!