Update function names

[jessicasalmon]

I've updated function names (by removing 'test'), so that they are less confusing.

I made a new naming convention whereby TFL is always capitalised in const/let/var e.g.

• tflData -> TFLData

Please check carefully as there's a lot of renaming here.

relates #65

[codecov-io]

Codecov Report

Merging #74 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #74   +/-   ##
=======================================
  Coverage   95.52%   95.52%           
=======================================
  Files           4        4           
  Lines          67       67           
=======================================
  Hits           64       64           
  Misses          3        3

Impacted Files	Coverage Δ
src/tflLogic.js	94.73% <100%> (ø)	:arrow_up:
src/tflAPI.js	87.5% <100%> (ø)	:arrow_up:
src/handler.js	100% <100%> (ø)	:arrow_up:

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[joeylouise]

All good 👍