Use `coerceArray`

[groenroos]

416 introduced a coerceArray method for forcing any variable into an array.

This PR implements that method throughout the app.

[codecov[bot]]

Codecov Report

Merging #418 (643a5bb) into master (1cb6ee1) will decrease coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #418      +/-   ##
==========================================
- Coverage   98.05%   98.05%   -0.01%     
==========================================
  Files          37       37              
  Lines        4581     4575       -6     
==========================================
- Hits         4492     4486       -6     
  Misses         89       89              

Impacted Files	Coverage Δ
core/loadServer.js	94.48% <100.00%> (-0.04%)	:arrow_down:
drivers/db/Memory.js	99.09% <100.00%> (-0.03%)	:arrow_down:
lib/Response.js	98.45% <100.00%> (-0.01%)	:arrow_down:
lib/User.js	100.00% <100.00%> (ø)

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