(#4) GetByPrettyUrlName for OverrideRecord objects.

[blairl-nih]

• Rework ListingInfo and related models to support EvsRecord and OverrideRecord being stored in the same index.
• Change ListingPageAPIOptions.AliasName to ListingInfoAliasName to support separate indices for ListingInfo vs. LabelInformation.
• Add APIInternalException to Common in order to move toward only using APIErrorException in controllers. This needs to be copied to the template.
• New GetStringAsStream method on TestingTools class. This also needs to be copied to the template project.
• Removed unneeded config overrides from appsettings.inttest.json.

Close #4

[blairl-nih]

Obsoleted by design changes.