Support for combo plugs such as H5082 not fully implemented

When using a combo plug such as the H5082 the api only returns one devices.capabilities.on_off value which seems to be 1 if any plug is on and 0 if no plugs are on. Additionally when sending a on/off command it effects both sides of the plug instead of allowing for control of each side.

It'd be great if the API split both sides of the plugs into different values so this plug type could be controlled.