* include/freetype/config/ftheader.h: New macro `FT_SVG_RENDERER_H'
for `freetype/svgrenderer.h'.
* include/freetype/svgrenderer.h: New file to store SVG specific
function types, SVG interface and `FT_Set_Svg_Hooks'.
* src/base/ftobjs.c: Adds implementation of `FT_Set_Svg_Hooks'.
* src/svg/ftsvg.c: Creates `svg_renderer_interface'.
* src/svg/svgtypes.c: Moves hook function types to
`FT_SVG_RENDERER_H'. Adds a hook for svg rendering. Temporary.