Upgrade to swagger-ui v3.12.0 plus big fixes

• Upgrade swagger-ui to v3.12.0
• Add options to use references for enum definitions
• Fixes #520, #600, #633, #637, #639, #646

v2.1.0

• disables UI validator badge by default
• fixes/addresses #604

v2.0.0

• upgrades embedded version of swagger-ui from 2.2.10 to 3.10.0 . This involves breaking changes to the SwaggerUI config interface - see readme for details on the new interface
• renames the CLI package from dotnet-swagger to Swashbuckle.AspNetCore.Cli
• fixes/addresses #179, #210, #228, #231, #349

v1.2.0

• new package for embedded Redoc as an alternative to swagger-ui
• new package for dotnet-swagger CLI tool
• support for custom versions of swagger-ui index.html
• support swagger-ui at root url
• fixes/addresses: #157, #310, #404, #541, #557, #574

Minor bug fixes and enhancements

Fixes #288, #318, #336, #389, #402, #425, #523

v1.0.0-rc3

(Hopefully) the last RC before a stable release which will follow shortly assuming no major issues.

Addresses:
#171, #249, #255, #266, #267, #274, #305

Breaking Changes:

1. the helper for enabling the UI middleware has been renamed from SwaggerUi to SwaggerUI to align better with .NET naming conventions.