pangomm: New API in pangomm 1.8

# New API in pangomm 1.8

Member Pango::FontDescription::get_size_is_absolute () const
  .

Member Pango::FontDescription::set_absolute_size (double size)

Member Pango::Layout::get_font_description () const
  .

Member Pango::Renderer::activate ()

Member Pango::Renderer::deactivate ()

Member Pango::Renderer::draw_error_underline (int x, int y, int width, int height)

Member Pango::Renderer::draw_glyph (const Glib::RefPtr< Font >& font, Glyph glyph, double x, double y)

Member Pango::Renderer::draw_glyphs (const Glib::RefPtr< Font >& font, const GlyphString& glyphs, int x, int y)

Member Pango::Renderer::draw_layout (const Glib::RefPtr< Layout >& layout, int x, int y)

Member Pango::Renderer::draw_layout_line (const Glib::RefPtr< LayoutLine >& line, int x, int y)

Member Pango::Renderer::draw_rectangle (RenderPart part, int x, int y, int width, int height)

Member Pango::Renderer::draw_trapezoid (RenderPart part, double y1, double x11, double x21, double y2, double x12, double x22)

Member Pango::Renderer::get_color (RenderPart part) const
  .

Member Pango::Renderer::part_changed (RenderPart part)

Member Pango::Renderer::set_color (RenderPart part, const Color& color)

Member Pango::Renderer::set_matrix (const Matrix& matrix)