Bug 574900: [Yaml-Source] Rework YAML parser - Update to YAML 1.2 - Update lexer to YAML 1.2 based on SnakeYaml (Engine) 2.3 - Correct namings to be in line with spec - Add unit tests for YAML parser (YAML test suite 2021-10-09) - Add reporting of more syntax error - Add unit tests for SyntaxProblemReporter Change-Id: If35f00bc32773d5aae0d083895dbb95b84bcc1ad