[sv-ac] strings and reals as property and seq arguments

Hi Lisa:

> Currently the std does not allow for passing strings or reals to a
> property or sequence.  Is there a desire to be able to do this?

I think that passing strings will be useful for customizing messages.
Constant strings could be passed as parameters if we add some parameter
mechanism to sequences and properties.

Reals might be useful in building boolean expressions.

J.H.