Analysis nodes - level of detail documentation

Each node should have a method that returns documentation as dictionary of lists.

Each key is a field, and each value is more and more detailed documentation. For instance EffectNode could have:

```
{
“Impact_min”: [“>=HIGH”, “VEP impact >= HIGH”]
}
```

Then we can walk through the lists, and use whatever text we need, depending on how much space we have.

This would allow us to put much more detail on the analysis node icons, and also use the longer ones as tooltips so you can see quickly the config of nodes