Remove dependeny on Nancy, update to Netcore 3.1 and Move to Carter

[samatstariongroup]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of the CDP4 Web Services
• I have searched open and closed issues to ensure it has not already been reported

Description

Nancy is not being maintained anymore. Since we need to move to .netcore 3.1 I propose we stop using Nancy and move to Carter. The following should be looked at:

• replace nancy with carter
• let sub projects target netstandard
• update dependencies such as autofac etc. to be inline with netcore3.1
• refactor use of config.json to appsettings to follow netcore standard practice
• add CDP4/COMET specific headers
• verify routing
• refactor annex c3 export capability to take permission handling and obfuscation into account
• expected errors (like unauthorized or notfound etc) should not be returned as a HttpStatusCode.InternalServerError (fix also in integration test suite)
• refactor LDAP authentication on enterprise edition to make use of newer ldap package that is compatible with netcore3.1 #298
• implement async-await for DAO and service layer (generate) -> not implemented right now. We may revisit when we notice that performance is an issue.
• regenerate all code to replace CDP4 with COMET
• favicon
• refactor SQL logging - remove use of ICommandLogger and remove setting from apssettings and coniguration
• implement logging abstractions
• add IIS implementation #293
• add landing page

see also #261

NancyFx/Nancy#3010

Steps to Reproduce

NA

System Configuration

• CDP4 Web Services version: 5.1.0