Add a "gut-based" Huntsman priority list

Accepting this pull request resolves #1.

Currently this is entirely based on my own hunches and will surely need revision.
It adds a ["Huntsman] entry to Protipper.Priorities which is a list of maps of
the following form:

```lua
Protipper.Priorities["Huntsman"] = {
    {
        "Ability Name",
        function()
            -- Return true if ability meets the conditions for using it.
        end
    },
    ...
}
```