add simple variants of all public module functions

[natecraddock]

The module functions are becoming a bit complicated (which is fine). This is to maximize the performance of zf. But there may be cases when a simple variant is preferred (small lists to filter, for example).

So each function can offer a simple variant, and then an extended version with more parameters for maximal control

[natecraddock]

After thinking about this longer I'm on the fence. I don't personally need it, so I think I'll only add it if someone expresses interest.

[natecraddock]

A good idea is a rankStrings function that accepts an allocator, a slice of strings, a query (and maybe other params) that can be used in more simple cases