ref: core data controller

[armcknight]

Moved everything core data related to CoreDataController. Centralizing it helps maintain both the database code, and the UI/controller/etc code it used to be sprinkled throughout.

[codecov]

Codecov Report

Attention: Patch coverage is 34.92063% with 82 lines in your changes missing coverage. Please review.

Project coverage is 37.382%. Comparing base (5663891) to head (9e1a17c).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
EmpowerPlant/CoreDataController.swift	29.629%	76 Missing ⚠️
EmpowerPlant/EmpowerPlantViewController.swift	70.000%	3 Missing ⚠️
EmpowerPlant/Product.swift	62.500%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##            master      #117       +/-   ##
=============================================
- Coverage   37.877%   37.382%   -0.496%     
=============================================
  Files           10        10               
  Lines         1027       955       -72     
  Branches       323       324        +1     
=============================================
- Hits           389       357       -32     
+ Misses         629       591       -38     
+ Partials         9         7        -2     

Files with missing lines	Coverage Δ
EmpowerPlant/AppDelegate.swift	93.023% <ø> (+27.854%)	⬆️
EmpowerPlant/ListAppViewController.swift	0.000% <ø> (ø)
EmpowerPlant/SceneDelegate.swift	66.666% <ø> (+21.839%)	⬆️
EmpowerPlant/ShoppingCart.swift	26.190% <ø> (ø)
EmpowerPlant/Utils.swift	80.000% <ø> (+37.142%)	⬆️
EmpowerPlant/EmpowerPlantViewController.swift	68.487% <70.000%> (+8.127%)	⬆️
EmpowerPlant/Product.swift	62.500% <62.500%> (ø)
EmpowerPlant/CoreDataController.swift	29.629% <29.629%> (ø)

... and 1 file with indirect coverage changes

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