* Adds v2 spec additionalproperties examples, adds v3 spec nulllable model example, updates samples
* Remaining samples updates
* Adds csharp generator update to handle models with multilevel parent types, which works for the AdditionalPropertiesObject model, samples updated
* Issue 1766 Modified mustache files for Go to support nullable in the spec v3.0+; Updated model files running .sh scripts for Go.
* Add "nullable" to fake yaml
* Add sample script for OAS3
* Fix output folder (openapi3)
* Run bin/openapi3/go-petstore.sh
* Update samples
* Update jaxrs-jersey
* Update python and php samples
* Add bin/openapi3/go-gin-petstore-server.sh
* Run bin/openapi3/go-gin-petstore-server.sh
* Update bin/openapi3/go-petstore-server.sh to generate "nullable" samples
* Run bin/openapi3/go-petstore-server.sh
* Fix duplicated `import`
* use double-quote string for enum value (#2081)
* use enumVars in templates for Ruby client (#2081)
* delete unnecessary line in enum model of Ruby client (#2081)
* update samples of Ruby client (#2081)
* update samples
* remove string boolean map spec
* add logic to skip array alias being generated as model
* fix alias to array
* remove unused ruby files
* remove unused ruby (oas3) files
* unalias response schema
* fix NPE when no model defined
* fix ruby openapi3 script
* update samples
* add global openapi, schemas for unaliasing
* minor code cleanup/refactoring using globalSchemas
* Revert "minor code cleanup/refactoring using globalSchemas"
This reverts commit 20a2bbc6fc4267a0e0768dcf5f15d4194ce9647b.