Step elaboration, typo fixes and using statements reorganization#71

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TrapperHell wants to merge 3 commits intonbarbettini:masterfrom TrapperHell:master

+73-45

Commits on Sep 24, 2018

- Elaborate just a bit more on some missing steps
TrapperHell
committed

Commits on Feb 23, 2019

- Switch from ApplicationUser to IdentityUser (which is part of Microsoft.AspNetCore.Identity)
TrapperHell
committed

Commits on Feb 25, 2019

- Undo Windows-specific path traversal changes
TrapperHell
committed