* Fixes so that a oneOf schema with a single sub-schema is simplified when SIMPLIFY_ONEOF_ANYOF is set to true
* Adjusts oneOf_array test to ensure that it is generated as an interface instead of being simplified
* Update ruby samples so that they no longer refer to a model that is now gone due to the schema being simplified
* Revert "v7.12.0 release"
This reverts commit 073723cb4d41187f839fbb46565d109293fa22d7.
* set version to v7.13.0-SNAPSHOT
* update samples
* update doc
* made Configuration.defaultApiClient volatile so that if it's changed the new value is immediately visible to all other threads
* made no-arg api ctor use Configuration.getDefaultApiClient() instead of creating new ApiClient every time
* replaced all use of URLEncoder.encode with ApiClient.urlEncode; just code cleanup; no functional changes
* disabled AbstractJavaCodegenTest.testGeneratedExampleValues as it fails, possibly due to timezone (Locale.ROOT) of local system
* replaced thread-unsafe SimpleDateFormat with DateTimeFormatter and re-enabled unit-test
* removed unused import
* ran the generate-sample scripts and generated a HUGE number of changes!
* added missing import of Configuration to api.mustache (and, thus, all native samples)
* added missing import for ApiClient to anyof and oneof model mustaches
* issue-1960: Add nullability annotations to Java generated clients
Motivations:
Have generated clients properly annotated for nullability to be able to check code using them with tools like NullAway
Modifications:
* Add nullable_var_annotations template to handle nullability annotation on vars
* Add pojo templates to use the nullability template
* Adapt tests
* issue-1960: Add nullability annotations to Java generated clients
Modifications:
* Run export_docs_generator.sh script to update samples
