More Datalink QoL Changes

[Syntax505]

• Fix for METAR caching bug
• Fix for empty METAR requests
• (TODO) METAR/TAF Formatting
• (TODO) ATIS Formatting
• (TODO) METAR Receival Advisory
• (TODO) ATIS Receival Advisory

[slip664]

Here's that video that shows the formatting if you need the reference: https://www.youtube.com/watch?v=JCpWqV-Pv_Q

Also, I'm sure you're aware, but you can use [d-text] to get the "normal" text size on the lines between LSKs.

[Syntax505]

Had to leave this draft PR for a while as I got a bit busy with schoolwork. Will have more time to work on it in a day or two as holidays start.