Change fonts at runtime

[zoriya]

We can use addFont to make a new font available, but we can't remove fonts that won't be used anymore to free resources.
Right now, I am doing this to change fonts but old one are still taking some RAM:

if (fonts) {
	for (const font of fonts) {
		subOcto.addFont(font);
	}
}

[ThaUnknown]

i never added it because i honestly have no clue how to remove fonts from libass safely x)

[zoriya]

Okay, I guess fonts are not big enough to be a bother anyway, thanks for the feedback