* Add device type HT-EM4 for Hitron Technologies
adding Hitron HT-EM4 Moca Adaptor
* Add manufacturer and model details for HT-EM4
corrected yaml
* Fix formatting and update device attributes in HT-EM4.yml
* corrected formating
* Clean up HT-EM4.yml by removing empty fields
Removed unused fields from the HT-EM4 device YAML configuration.
* updated power and comment
* Update manufacturer and model names in HT-EM4.yml
* Update model and slug for Hitron HT-EM4
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Co-authored-by: Harry <Harry@cadby.co.uk>