Add new types of permissions for user's operations

We need the ability to prevent users from performing certain actions, so we need a new enumeration of user permissions. This enumeration should contain following permissions:
SEND_PRIVATE_MESSAGES - this permission is needed to send the private message, but we will use it by vice versa
EDIT_PROFILE - this permission is needed to edit the profile, but we will use it by vice versa

Note, that GeneralPermission and BranchPermission aren't suitable for these permits.