models: move Application LDL def into a json file

Move some of the comments describing properties into jsdoc.
models: move AccessToken LDL def into a json file
models: move Scope def into its own files
models: move ACL LDL def into a json file
models: move RoleMapping def into its own files
models: move Role LDL def into a json file
models: move Checkpoint LDL def into a json file
models: move Change LDL def into a json file