Use AsTask() - #349

CA2012 nowarn still exists for tests

I did not use AsTask so as to be sure that there was no allocation occurring. But whatever you think.

Also note for SDLSorter that it is impossible to run asynchronously since it uses a static instance (cannot be derived) and the options class has no async members. (If I remember correctly.)

Excellent!

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.24%. Comparing base (cdd6106) to head (ebd092a).
⚠️ Report is 55 commits behind head on master.

@@           Coverage Diff           @@
##           master     #349   +/-   ##
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  Coverage   96.24%   96.24%           
=======================================
  Files          89       89           
  Lines        4975     4975           
  Branches      494      494           
=======================================
  Hits         4788     4788           
  Misses        187      187           

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