Add way to specify all productions in FISHI %actions block

[dekarrin]

For an SDTS to perform the same semantic action for multiple productions, each production must be specified as well as the parameters it accepts in the %actions block of its FISHI spec. This can be tedious.

Add a new token %all or some other suitable token or shorthand (perhaps *) that comes directly after %prod/-> and specifies that the following semantic action should be applied for all productions of that symbol. It is permissible to give an "%all" semantic action along with any others for the same symbol; the %all will simply be applied to each one after any semantic actions for that symbol that come before it.

Issue created from work on #79