Add Satvis Focus on Satellite

[jekhokie]

Change satellite names to hyperlinks when the Satvis view is enabled in the pass list, enabling clicking on a satellite name and "focusing" on the satellite in the Satvis view when clicked.

[dom-robinson]

I realise this is closed, but it still bugs me that ALL weather satellites are showing when we ONLY want NOAA 15,18,19 and M2.

So i read through the satvis code, and now understand how it works. The 'tags' that are called collect groups of satellites for display. These tag groups are NOT defined by the satvis software directly - they are derived from the way that NORAD is grouping satellites in thier TLE files.

At the moment we use the hosted service from satvis. If we move to installing satvis on the raspberry-pi locally (i am loath to 'just default install' since it also brings in its own static webserver, and i can guess that will be a PITA to work around RN2's NGINX - although i haven't looked) then the fiddle we want to do is here:

https://github.com/Flowm/satvis/blob/11054d95c4e997f4d6db05ce86d5dd45674b47a2/src/app.js

If we grep / awk out a cut down weather.txt in RN2's workflow (we currently store the txt in /tmp and it contains lots of superflous satellite tles we don't need) and filter it down to ONLY contain the satellites we want listed in satvis, then this URL model would work:

https://<my-host>/?elements=Point,Label,Orbit%20track,Sensor%20cone&layers=OfflineHighres&gs=50.816368,-0.06511&tags=**Weather**

and that would give us a satvis image that looks like this instead of the current (overpopulated and messy ,and CPU demanding version we currently have)

However this will require installing and running satvis from local PI