fix genlist/grid search item patch to be simpler and just better

fix genlist/grid search item patch to be simpler and just better

better - why?

1. no reliance on fnmatrch headers - have special enums for this so
fnmatch is an internal detail (casefole may not exist)
2. don't leak strduped strings - free them when done
3. have the same code for genlist and grid (dup for now until an
interface makes it the same search interface)
4. improve docs
5. get right @since version
6. use label get func in item class - providing a func won't work when
multiple items of multiple classes exist in the list