glyph-brush-0.7.7

• Allow Text::new to work with any X type. This may break usage, however it will hopefully be non-breaking in practice as the compiler should always be able to infer this.
• Add Section::builder for more flexible X/"extra" type usage than Section::default & for owned text too.
• Add more flexible X type usage to GlyphBrush::keep_cached.
• Add Section::from(text) & Section::from(vec![text]) conversions.
• Update GlyphCruncher::glyphs, GlyphCruncher::glyph_bounds docs.