Standalone: Fix ACL help/links, tweak Users and Permissions menu

[mlutfy]

Overview

On CiviCRM Standalone:

• Go to Administer > Users and Permissions > Permissions
• the "Standalone Access Control" link leads to a "fixme" 404

Also, the "Manage Users" and Roles links are not under "Users and Permissions".

This PR changes the following:

• sets the ufAccessURL so that it leads to lead to manage "User roles"
• tweaks the wording a bit on the Manage ACL page, so that it's less awkward when using Standalone. After all, it's not "Standalone Foo", it's just Foo. Users are aware that they are using CiviCRM, not that they are using CiviCRM Standalone.
• moves the User Roles and User Accounts menu items under "Users and Permissions"

Before

Navigation menu:

After

Comments

Moving the menu items: I realize this hinders discoverability a bit, but I think it also declutters, therefore making menu navigation easier.

Reported by dsp3926 on the standalone chat

cc @artfulrobot

[civibot]

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[artfulrobot]

Thanks, this looks good pending couple of comments made on the code.

[mlutfy]

With the latest changes, for when running inside a CMS:

[artfulrobot]

Looks good to me. Thanks @mlutfy

[mlutfy]

Thanks @artfulrobot ! I took the liberty of adding MOP tag to the PR.