* breaking upgrade base build image to net5.0
* add make and build tools to image
* fix code broken after net5.0 upgrade
* fix warnings
* fix tests and line endings
* upgrade dotnet test and coverages packages
* update circle build image
* removed rafty and updated more packages
* bring back develop
* rename authorisation to authorization
* #630 only set status code if response hasnt started, otherwise exception
* #623 made {RemoteIpAddress} available as placeholder so you can do x-forwarded-for
* #623 local address different on mac, windows and linux for integration test