Add label to .on(queue:)

[jeppes]

• Add label: .on(.main) --> on(queue: .main)
• Add warning about using this function in raw loops.

@JensAyton

[codecov]

Codecov Report

Merging #157 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #157   +/-   ##
=======================================
  Coverage   94.39%   94.39%           
=======================================
  Files          45       45           
  Lines        1249     1249           
=======================================
  Hits         1179     1179           
  Misses         70       70           

Flag	Coverage Δ
#ios	94.39% <100.00%> (ø)
#macspm	?

Impacted Files	Coverage Δ
...obiusCore/Source/EffectHandlers/EffectRouter.swift	98.24% <100.00%> (ø)

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