Multiple discord post formats

[aussig]

Different groups / squadrons have different needs when reporting to Discord. It would be useful to support different formats. For example, a simplified black-and-white format with system titles in bold:

HIP 117865
Celestial Light Brigade : +51 Inf, 808k Bounties

To achieve this would need the following approach:

• Rationalise all discord formatting code into a single formatter class, which has two main entry-point methods: get_plain_text() and get_embed_fields().
  1. Initially there will be just one formatter -- the default -- to replicate the current format.
  2. Each method takes an instance of the Activity class as its source data.
• Place the formatter class in a subfolder
• Add a picker to the preferences screen to allow the formatter to be chosen from all available in the subfolder. Could do this for each Discord channel if we're being completist (maybe for v2?)
• Use the selected formatter when posting to Discord.

[aussig]

Closed in 84f35f6