Move plot metadata currently in title into properly formatted plot elements

### What problem does your feature request solve?

The plot title we currently have is just the default matplotlib title. While this has served us until now, we can do better with some specific formatting for the various kinds of metadata we want to include along-side our plot.

### Describe the solution you'd like

Do some proper layout to logically group the information while maximising visible plot area.

### Describe alternatives you've considered

GPPdisplay


WXCharts


The issue does not name any files, tests, or entry points. Start by locating the code that builds the Matplotlib plot title and assembles plot metadata, then compare its output with the GPPdisplay and WXCharts examples. Done means the metadata is grouped into properly formatted plot elements while maximising the visible plot area.

Written by the indexing model from the issue text.