Enhanced Contact Us V1.0

- Rebuilt as separate Enhanced Contact Details and Enhanced Contact Form PI modules.
- Added Admin-managed contact details, telephone number, VAT number, opening
  hours, guidance text, reply text, optional heading and enquiry-box height.
- Added automatic Phoenix Visual Designer discovery and independent visual
  control of both PI modules.
- Corrected Phoenix store defaults to use STORE_ADDRESS, STORE_PHONE and
  STORE_TAX_ID.
- Retained Phoenix human verification, CSRF validation and action recording.
- Added a secure logged-in customer order selector with server-side ownership
  verification.
- Changed the order selector to an unselected enquiry-type prompt with clear
  General question and Previous orders choices, validated server-side.
- Added subject, customer, order, telephone, date/time and IP information to
  the enquiry email.
- No Phoenix core files are changed.
