Casbin for Java & Casdoor

The jCasbin needs to enhance the expressiveness of the grammar to meet the diverse needs of the user's policy development. For example, the special syntax of "in", the update of the role manager, etc. At the same time, it is also necessary to maintain and integrate the unique ecology of Java, such as casbin-spring-boot-starter and Play middleware, etc. Performance is also a point of great concern, so it's necessary to benchmark and optimize the performance for policy evaluation on large rule sets. Casdoor also needs to move forward with development. Some features need to be added to match a variety of complex production environments.