Add (optional) verbose to the file generation

[pablokrupa]

Currently, there is no option to provide some feedback to the user about the generation of the MPC solver. It would be useful to add a verbose option to spcies_gen_controller(). If set to true, the toolbox should display information about the solver that has been generated, including:

• MPC formulation
• Optimization method
• Toolbox and code-generation options
• Solver options
• Files that have been generated (with their locations)
• Confirmation that everything has been generated correctly and that the generation process has finished