Contact Us Essentials. Send messages to specific email recipients and/or threads in a specific forum 2.3.0

Made compatible with Xenforo 2.3. This release is not compatible with 2.2 and earlier versions of Xenforo.
We continue to use Contact Us Essentials to manage our inbound messages both as emails to specific members of the team and also posted as threads in specific forums for the attention of moderators/admin.

Fixed incompatibility issue with Xenforo 2.2.16.

• Add missing custom field delete template.
• Fix issue with using contact form when only one recipient group exists