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Fix get_glyph_shape panic consola \u{feff}

Closes #19

See merge request !28

Panics with
```
let consolas = 
    stb_truetype::FontInfo::new(&include_bytes!("../consola.ttf")[..], 
0).ok_or("bad font")?;
let feff_id = consolas.find_glyph_index('\u{feff}' as u32);
let _ = consolas.get_glyph_shape(feff_id);
```
Fixes #19

Edition 2018

See merge request !27

Add benchmark test for compound glyph shape

See merge request !26

roboto_colon bench 1.05 faster

Use i8 positions in compound glyphs

Closes #18

See merge request !25

Safe rework of get_glyph_shape

Closes #15 and #16

See merge request !24

Remove unsafe usages
Don't use Vertex data for 2 different thigns
Simplify type usages

Fix/address clippy lints

See merge request !23

cargo fmt + remove commented code

See merge request !22

Optimise get_v_metrics, scale_for_pixel_height

See merge request !21

Optimise get_glyph_h_metrics

See merge request !20

3.5x faster benchmarks

Optimise get_glyph_box

See merge request !19

Optimise find_glyph_index (format=12,13)

See merge request !18