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.

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<?xml version='1.0' encoding='utf-8'?>

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<BeremizRoot xmlns:xsd="http://www.w3.org/2001/XMLSchema" URI_location="PYRO://127.0.0.1:3000">

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  <TargetType>

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    <Linux/>

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  </TargetType>

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  <Libraries Enable_SVGHMI_Library="false" Enable_Native_Library="true" Enable_Python_Library="false"/>

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</BeremizRoot>