Checks to recognize already bound interfaces

- HardwareComponent
The interface binding using only the ports was not working so I decided
to use signals to it. Thus the get_interface method will work even
without the need of elaborate the components.

When using this approach was needed add checks to avoid using new
instance of signals in the same component, what causes an exception in
systemC.
Workarround in generating the architecture

- HardwareComponentConverterVHDL
To generate the architecture its necessary to extract the structural
information from systemC constructs. However it have shown to be hard
extracting this information without throwing any SystemC exception.
fixing path

The library paths were wrong
Adding some new calls for tests

Adding calls to generate VHDL