libass doesn't support fontconfig < 2.4.2 so fallbacks for these
ancient versions aren't needed anymore. Also update the man page
(English, German) to reflect the change. Additionally note that
-embeddedfonts controls the use of ASS script embedded fonts too.
-embeddedfonts is now always enabled by default. Fonts are never
extracted into a directory anymore but passed to libass via memory.
FreeType's native hinter causes rendering errors with many fonts,
especially with broken fonts that unfortunately tend to be used a
lot with SSA/ASS subtitles. Use the light autohinter for unscaled
OSD by default to avoid these problems.