Precision rules: Make sure we can use a list of dictionnaries as expected and enables protected names

• We now can use a list of dictionaries in a project instead of a single one, and this is normally backward compatible with projects using it
• Add the possibility to define a set of exception keywords that should be protected.

This is needed in rapack to be abme to declare both rpk_[sdcz] variables, and rpk_diag_t (@acalluau)