Upgrade to HSQLDB 2.7.0

-- version 2.7.0 jar requires JRE 11 or later - tested up to Java 17
-- version 2.7.0 alternative jar requires JRE 8 or later
-- added support for JSON constructor functions
-- added support for microsecond precision CURRENT_TIMESTAMP and similar functions
-- added support for GRANT and REVOKE on all objects in a schema
-- added support for CSV file data import and export
-- added support for regional time zones such as 'America/New_York' in conversions
-- added SET DATABASE SQL MAX RECURSIVE (sql.max_recursive) setting
-- changed the default for SET DATABASE SQL SYS INDEX NAMES (sql.sys_index_names) to true
-- changed the properties reported by JDBC DatabaseMetaDat::getClientInfoProperties() method
-- improved  JDBC DatabaseMetaDat::getTablePrivileges() method to cover fine-grained privileges
-- improved error messages for SQL settings statements
-- improved documentation
-- added some minor enhancements
-- fixed a number of reported regressions and bugs (see tracker)