Adjusting public methods arguments to support JSON-RPC

[DerAndereAndi]

Right now the public methods arguments require an argument entity spineapi.EntityRemoteInterface to specify which entity of which remote device is meant. This can not be used / represented via JSON.

To make this work, the idea would be to use an SPINE model.EntityAddressType similar data type. The SPINE data definition is:

type EntityAddressType struct {
	Device *AddressDeviceType  `json:"device,omitempty"`
	Entity []AddressEntityType `json:"entity,omitempty"`
}

A compatible and easier to use data type would be:

type EntityAddressType struct {
	Device string
	Entity []uint
}

This can be easily represented in JSON and also used to get the corresponding entity spineapi.EntityRemoteInterface which is needed to invoke the functions. The data structure can also be easily created in the callback functions from an entity spineapi.EntityRemoteInterface data type using a generic helper method.

[DerAndereAndi]

This wouldn't be enough, as each exported method needs to have a second pointer variable for the response. Which in turn would change how everything works.