add more info to actions and triggers: tags from ids files

Eg. marking if an action is instant (in instant.ids), a trigger saved (svtriobj.ids) and so on, if any (not sure anyone cares about actsleep, chase, nodecode).

It has to be per-game, since eg. ActionOverride is not an instant in iwd2, plus iwd2 has instants split into two files for separate uses. There are likely other differences like that.