Feature - Add filter to disable dynamic tag previews in editor

[iansvo]

Closes #1583

[tomusborne]

Aside from the comments above this looks good. Any reason you chose to go with enabled and disabled vs just letting the true or false of the filter come through?

[iansvo]

@tomusborne When you add stuff in the inline script output like that it doesn't actually use true/false, it just sets the value to a number. So I figured this would be a bit more obvious than '1' or '0'.