RawGlyph field clarification

Made RawGlpyh use GlyphId for glyph indexing

Author: zeonzip

src/gsub.rs

@@ -23,8 +23,8 @@ use crate::layout::{
 };
 use crate::scripts::{self, ScriptType};
 use crate::tables::variable_fonts::Tuple;
-use crate::tag;
 use crate::unicode::VariationSelector;
+use crate::{tag, GlyphId};
 
 const SUBST_RECURSION_LIMIT: usize = 2;
 
@@ -123,7 +123,7 @@ impl Ligature {
 #[derive(Clone, Debug)]
 pub struct RawGlyph<T> {
     pub unicodes: TinyVec<[char; 1]>,
-    pub glyph_index: u16,
+    pub glyph_index: GlyphId,
     pub liga_component_pos: u16,
     pub glyph_origin: GlyphOrigin,
     pub flags: RawGlyphFlags,