message: Spell out some field names
diff: @@ -169,11 +169,11 @@ struct TtcHeader2 (file_start : Pos) {
  /// Array of offsets to the OffsetTable for each font from the beginning of the file
  offset_tables : Array num_fonts (Offset32Be file_start (OffsetTable file_start)),
  /// Tag indicating that a DSIG table exists, 0x44534947 ('DSIG') (null if no signature)
  - dsig_tag : U32Be, // FIXME: Tag?
  + digital_signature_tag : U32Be, // FIXME: Tag?
  /// The length (in bytes) of the DSIG table (null if no signature)
  - dsig_length : U32Be,
  + digital_signature_length : U32Be,
  /// The offset (in bytes) of the DSIG table from the beginning of the TTC file (null if no signature)
  - dsig_offset : Offset32Be file_start (DigitalSignature dsig_length),
  + digital_signature_offset : Offset32Be file_start (DigitalSignature digital_signature_length),
  };
  @@ -1220,7 +1220,7 @@ struct LongHorMetric {
  /// Advance width, in font design units.
  advance_width : U16Be,
  /// Glyph left side bearing, in font design units.
  - lsb : S16Be,
  + left_side_bearing : S16Be,
  };
  @@ -1628,7 +1628,7 @@ struct Glyph {
  struct SimpleGlyph (number_of_contours : U16) {
  /// Array of point indices for the last point of each contour, in increasing
  /// numeric order.
  - end_pts_of_contours : Array number_of_contours U16Be,
  + end_points_of_contours : Array number_of_contours U16Be,
  /// Total number of bytes for instructions. If instruction_length is zero, no
  /// instructions are present for this glyph, and this field is followed
  /// directly by the flags field.
  @@ -3809,7 +3809,7 @@ struct Color0 {
  struct BaseGlyphRecord {
  /// Glyph ID of reference glyph. This glyph is for reference only and is not
  /// rendered for color.
  - g_id : U16Be,
  + glyph_id : U16Be,
  /// Index (from beginning of the Layer Records) to the layer record. There
  /// will be numLayers consecutive entries for this base glyph.
  first_layer_index : U16Be,
  @@ -3819,7 +3819,7 @@ struct BaseGlyphRecord {
  struct LayerRecord {
  /// Glyph ID of layer glyph (must be in z-order from bottom to top).
  - g_id : U16Be,
  + glyph_id : U16Be,
  /// Index value to use with a selected color palette. This value must be
  /// less than numPaletteEntries in the CPAL table. A palette entry index
  /// value of 0xFFFF is a special case indicating that the text foreground
  