Added Methods for Checking and Requesting User Permissions

The API V7 has added methods for checking user permissions (CheckPermission, CheckPermissions) and methods for requesting permissions (ShowCheckPermissionPopup, ShowCheckPermissionsPopup) (see the article “Checking and Requesting Permissions”).

For convenience, methods for obtaining the current user GetCurrentUser and the current role GetStrictAccordanceToScheduleUserRole have been added.