Using mmouse's API for miner-specific stats to show on main page

If the API patches are not in place, the two new columns are hidden for backwards compatibility. The API changes required to benefit from these columns can be found at https://github.com/donSchoe/p2pool-n/pull/7. The API changes and front end support for it were written by https://github.com/mmouse-.

Our intent is to get these things further upstream to the main repo, and then eventually to remove web-static.modern from https://github.com/donSchoe/p2pool-n completely and make it a subproject reference instead to this main interface repo.

https://github.com/mmouse- had other tweaks and formatting changes in his version, but I tried to minimize that here and only merge the code for the miner stats/etc vs the current parent repo. I did remove the "payout NOW" stuff, highlighting of "pool address" could be done in the miner list instead. It's confusing/unneeded on public nodes and I think it's best removed? I also renamed the miner share value column to avoid confusion for people unfamiliar with p2pool.

Please make any further changes you think are needed so we can nicely get this all folded into the parent repo please. :)