impr: allow bypassing slow launch work

[armcknight]

Added a launch argument to the schema, disabled by default for now, that can be enabled to skip the slow launch demo sequence. This will make iterative development on the app itself less painful.

Also refactored to extract all the simulation code to a dedicated file for the purpose, to further unclutter EmpowerPlantViewController from too much non-UI/nav code.

[codecov]

Codecov Report

Attention: Patch coverage is 91.37931% with 5 lines in your changes missing coverage. Please review.

Project coverage is 38.289%. Comparing base (b1a505d) to head (bc3c9c1).

Files with missing lines	Patch %	Lines
EmpowerPlant/SlowOperations.swift	89.583%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##            master      #119       +/-   ##
=============================================
+ Coverage   37.866%   38.289%   +0.422%     
=============================================
  Files           10        11        +1     
  Lines         1022      1029        +7     
  Branches       330       335        +5     
=============================================
+ Hits           387       394        +7     
  Misses         628       628               
  Partials         7         7               

Files with missing lines	Coverage Δ
EmpowerPlant/EmpowerPlantViewController.swift	56.506% <100.000%> (-3.854%)	⬇️
EmpowerPlant/SlowOperations.swift	89.583% <89.583%> (ø)

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