Add fine-grained control over what the status looks like with format strings

[ungive]

It would be nice to be able to customize your status in perfect detail by controlling exactly where each piece of information goes, e.g. with the use of format strings. Example: Playing {title} - {artist} which replaces variables in curly braces with actual song metadata.

Pros:

• Users can make their status appear just the way they want
• Makes Music Presence stand out from other presence implementations and the official Spotify integration

Cons:

• The Discord status that is created by Music Presence may lose its uniform look
• People could put offensive text into the status, which then might have show the button "Get this status" which would then possibly link the brand "Music Presence" with that offensive text, which is not very desirable. Theoretically users could already do that though by modifying an MP3's metadata, which is out of my control. So this is really a non-issue.
• I can't make this feature experimental/temporary if I add it for all users. If I were to remove it again, reduce it's functionality or change it in some significant way in the future, some number of users could be inclined to downgrade Music Presence, just to be able to keep using it the way it was, which is something I want to avoid (i.e. avoid users being both dissatisfied and preferring to use an older version over the latest version).

Questions:

• Who is responsible for the text that is shown in a Discord status? What if offensive text is in there? What if e.g. a NSFW cover image is shown in that status? Is it the responsibility of the Discord user or the application developer? The fact that anyone can use someone elses Discord Application ID makes me think it can't be the responsibility of the developer what is shown in a status.

Options:

• Make this feature accessible for everyone right away. I might lose the ability to change it significantly or remove parts of it again without risking the points above.
• Only make this feature accessible to Patreon members (at the very least until it's mature enough to go live for everyone). The status will look uniform for the majority of users, but those that want more customization can get it by subscribing to the cheapest Patreon tier. Additionally I get the option to disable the feature again, including for older versions (if it's absolutely necessary), since the feature would be dependent on authentication and it could be controlled server-side.
• Do not implement this at all. Not really an option, would be wasted potential.

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Format variables:

• title: song title
• artist: song artist(s)
• album: song album name
• player: the name of the player

Format strings (default):

• title (1): "{title}"
• subtitle (2): "{artist}"
• extra (3): "{album}"
• image_text: "{album}"

When paused (example):

• title (1): "{title}"
• subtitle (2): "{artist}"
• extra (3): "Paused"
• image_text: "{album}"

Notes:

• "title" is the first line (or the second line when using the "Playing" type), "subtitle" is the line below that and "extra" is used as the third line with "Listening to" only and will be used as image text as well (that's how Discord displays it at the moment)
• "when paused" is used inplace of the original format strings when the song is paused and if showing the status while paused is enabled

Todo:

• Escape curly braces? See https://fmt.dev/9.0.0/syntax.html (Use {{ and }})
• Use something other than curly braces? Might be hard to find on some keyboards.
• Using the player ({player}) e.g. in the "title" for the "Listening to" activity type to mimic the Playing listening type will show the player name twice when switching to the "Playing" activity type. The user would have to change all format strings (or shift them). Add the option for profiles between activity types? One profile for "Listening" and one for "Playing"?