Implement ExternalSensor Concept

Hi Waleri,

The format for the report is:
<error file="sources/utils/code_chunks.cpp" line="1" id="cxxexternal-unusedFunction" severity="style" msg="The function 'foo' is never used"/>

Might be a good idea to polish, i agree. Severity is not needed in this case since its available in sonar. 

Let me know what you think based also in our previous discussion