Allow specifying font name in fontSources config

[danielhjacobs]

Describe the feature
Provide a clear and concise description of your feature request. Why would this feature be useful? Does the feature involve the desktop build, the web build, or both?

When using a TTF file as a font source, can there be a way to specify the name (and maybe also boldness and italicness) of the font for which to use that TTF file? Right now, it's based on the font name defined within the TTF file or falls back to the URL if no font name exists within the TTF file, but if you didn't create the TTF file and don't have the ability to edit the SWF file the font name in the TTF file may not match the font name requested by the SWF.

ruffle/web/src/builder.rs

Lines 422 to 433 in 41e373c

	let full_name = face
	.names()
	.into_iter()
	.find(|name| name.name_id == ttf_parser::name_id::FULL_NAME)
	.and_then(|name| name.to_string());
	let name = if let Some(full_name) = full_name {
	full_name
	} else {
	tracing::warn!("Font {url} at index {index} has no full name, using URL as font name");
	url.to_string()
	};

[danielhjacobs]

Side note: It's pretty useless that it falls back to the as-is URL. It may be at least slightly useful if it fell back to the URL slug sans file extension.

[danielhjacobs]

Also note, because fontSources is defined as an array of strings currently, support for this may require letting fontSources be an array of strings or a structure like this and doing different logic depending which it is:

fontSources: [
    "fonts/Noto-Sans-Bold.swf": {
        "name": "Noto Sans",
        "bold": true,
        "italics": false
     }
]