support range for string parameters

[gjcoram]

error: unexpected token ''{'; expected '(', ''{', system function identifier, identifier, literal, '~', '!', '+' or '-' --> /home/gjcoram/modeling/cmc_qa/cmcqa/model_qa/veriloga/vacode/param_example2.va:18:36 | 18 | parameter string type = "NPN" from '{ "NPN", "PNP" }; | ^^ unexpected_token

error: could not compile param_example2.va due to 1 previous errors