Add ExtendedCall to PLCObject as a replacement of RemoteExec and reflect it in eRPC interface.

ExtendedCall is a generic remote procedure call that runtime code can register to and that IDE extensions can call.
For example a fieldbus extension can use ExtendedCall to browse the fieldbus devices connected to the runtime.

     1

# mqtt/__init__.py

     2

     3

from __future__ import absolute_import

     4

     5

from .client import MQTTClient

     6