[NEW] Option to prevent users from using Invisible status

[lucassartor]

Proposed changes (including videos or screenshots)

Add an admin option to allow/disallow the Invisible status option from all users. This option is available in the Accounts section.

If the option is turned off, the users.setStatus endpoint is also restricted from users trying to change their status to Invisible, throwing the following error:

{
    "success": false,
    "error": "Invisible status is disabled [error-not-allowed]",
    "stack": "Error: Invisible status is disabled [error-not-allowed]\n    at DDPCommon.MethodInvocation.<anonymous> (app/api/server/v1/users.js:425:13)\n    at packages/dispatch_run-as-user.js:211:14\n    at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1234:12)\n    at Object.Meteor.runAsUser (packages/dispatch_run-as-user.js:210:33)\n    at Object.post (app/api/server/v1/users.js:415:10)\n    at app/api/server/api.js:394:82\n    at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1234:12)\n    at Object._internalRouteActionHandler [as action] (app/api/server/api.js:394:39)\n    at Route.share.Route.Route._callEndpoint (packages/nimble_restivus/lib/route.coffee:150:32)\n    at packages/nimble_restivus/lib/route.coffee:59:33\n    at packages/simple_json-routes.js:98:9",
    "errorType": "error-not-allowed",
    "details": {
        "method": "users.setStatus"
    }
}

Issue(s)

Fixes #5020

Steps to test or reproduce

1. Login as a user that has the admin role
2. Go to the Administration->Accounts section
3. Disable the option to see the changes in the user's status

Further comments

[tmartincpp]

Really nice feature, thank you! Hope this will be able to be included in the future.