Recursively replace other parts of already processed names

[dv]

Before this PR I'd often have CSS class-names that are only partially minimized, like so:

<style>
.wk { ... }
.wk-float-center { ... }
</style>

This still created a lot of possible compression. After this patch, the remaining part of an already-partially-replaced name will also be minimized:

<style>
.wk { ... }
.wkxz { ... }
</style>

I haven't tested this much at all, and it might break some other things, but for me it's useful in its current form. Maybe it's useful for somebody else as well.

[mir3z]

Is someone gonna accept this PR? It's been hanging here for almost 2 years...