Exceptions

[renatocf]

Create a basic tops::exception and derived to be used as errors in the library.

[igorbonadio]

Tasks:

• [x] Create new namespace exception
• [x] Create base exception tops::exception::Exception
• [x] Create derived exception tops::exception::NotYetImplemented
• [x] Create derived exception tops::exception::OutOfRange
• [x] Create derived exception tops::exception::InvalidModelDefinition