-96) Enabled filters should be easier to look up. Currently most functions
- that work with filters spent more (duplicated) code on finding
- filters than on actually doing something useful with them. Dividing
- filters by type instead of filter file would reduce the lookup-code
- quite a bit.
+96) Filters should be easier to look up. Currently get_filter() has to
+ go through all filters and skip the filter types the caller isn't
+ interested in.