Fix FISHI frontend required space in %%actions

[dekarrin]

The FISHI frontend requires spaces in two places that is annoying to deal with:

• Between a terminal symbol and the ":" separating a production from an action (bug)
• Between a hook function's opening "(" and an attr ref that is a terminal symbol (known, called out in docs)

Fix the frontend perhaps by a more clever lexer combined with SDTS fixes such that the above no longer requires that you have spaces in it.