Changes to run sample app in user mode

[afawcett]

This change is 

[daveespo]

Aside from the comment about the way the constructor overload works, I'm good with this PR so once that's resolved, I can approve this

@daveespo made 2 comments.
Reviewable status: 0 of 19 files reviewed, 1 unresolved discussion (waiting on afawcett, ImJohnMDaniel, and john-storey-devops).

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sfdx-source/apex-common-samplecode/main/classes/selectors/AccountsSelector.cls line 40 at r1 (raw file):

	public AccountsSelector()
	{
		super(false);

I think we should use the overloaded constructor. It's more concise:

super(false,fflib_SObjectSelector.DataAccess.USER_MODE);

(applies throughout this PR)