instead of the script line itself knowing that it points to something,
pull it down to the argument level, so that each argument knows
if it points to something.
This will allow a single script line to point to multiple things (like trainers pointing to multiple text or scripts)
Animation scripts can use the same engine as map scripts and battle scripts... except that they include a new type of parameter.
With animation scripts, the last parameter of some lines is allowed to include arbitrarily many arguments. This is represented by putting the last argument in brackets `[]`.
