Add Environment Agency (UK) river gauge data stream

[jpolton]

I appreciated that this isn't for everyone but post the code as a PR incase it is useful to other UK users. I don't expect it to get merged as it is beyond the scope of an e-Paper-Weather-Display.

I've added a time series graph to display the last 24hr of river height data. These data are available from the Environment Agency for many England rivers, though you have to poke around their API to find the river you are interested in. Here shown for a river that is actually a tide gauge in Liverpool. To accommodate the extra graph I've moved some things around. (Though I've tried to separate the cosmetic and functional edits into separate commits. Especially the last two commits).

I've moved to date, update, wifi, battery (no visible) info to the top bar. Dropped the version and dropped the weather summary statement to accommodate the graph