Implements LRM 6.20.1 rule
- If the declaration of a design element uses a parameter_port_list (even an empty one),
  then in any parameter_declaration directly contained within the declaration,
  the parameter keyword shall be a synonym for the localparam keyword (see 6.20.4).
- All param_assignments appearing within a class body shall become localparam declarations
  regardless of the presence or absence of a parameter_port_list.
- All param_assignments appearing within a generate block, package, or compilation-unit scope
  shall become localparam declarations.

Only "generate block" rule is not implemented yet, because it does not create a context.

…stemVerilog