need to read 'disabled' property of Glyphs custom parameters

[anthrotype]

A Glyph.app's custom parameter may be disabled, the UI provides a checkbox that one can un-tick, and the serialized plist will contain an additional disabled = 1 attribute.
glyphsLib currently doesn't seem to care whether a custom parameter is disabled or not, and that's a bug:
googlefonts/glyphsLib#905

we should have our rust glyphs-reader do the right thing and only consider parameters to be active if not disabled.

[anthrotype]

I believe this should be fixed nowadays. I see code like this where we parse CustomParameters struct from plist:

fontc/glyphs-reader/src/font.rs

Lines 450 to 463 in 6d4a87b

	// these params can have an optional 'disabled' flag set; if present
	// we just pretend they aren't there.
	let mut disabled = false;
	let mut name = None;
	let mut value = None;
	for _ in 0..3 {
	let key: String = tokenizer.parse()?;
	tokenizer.eat(b'=')?;
	match key.as_str() {
	"disabled" => {
	let flag = tokenizer.parse::<i64>()?;
	disabled = flag != 0;
	tokenizer.eat(b';')?;
	}

fontc/glyphs-reader/src/font.rs

Lines 544 to 546 in 6d4a87b

	if let Some((name, value)) = name.zip(value).filter(|_| !disabled) {
	params.push((name, value));
	}