Because of how the validation engine works now [1], there's no reason to
keep adding names to each rule. Instead, create a single rule that
handles naming rules with a few other accessories. This change is not
necessarily simple, but it shrinks the `Rule` interface, and it's more
aligned with how the library works right now.
Personally, I think this API is much more straightforward than the
`setName()` method, as it's way more explicit about which rule we're
naming. Because of this change, the behaviour changed slightly, but it's
for the best.
Because of this change, I managed to remove a lot of code, but
unfortunately, it's quite a big-bang commit. It would be too complicated
to make it atomic since names are an intrinsic part of the library.
[1]: 238f2d506a
Because of how the validation engine works, there's no reason to keep
adding templates to each rule. Instead, creating a single rule that
handles templating rules will simplify the library greatly and shrink
the `Rule` interface.
Personally, I think this API is much more straightforward than the
`setTemplate()` method, as it's way more explicit which rule is being
templated.
