Move options/config related files from mpvcore/ to options/

Since m_option.h and options.h are extremely often included, a lot of
files have to be changed.

Moving path.c/h to options/ is a bit questionable, but since this is
mainly about access to config files (which are also handled in
options/), it's probably ok.

sub/osd_libass.c

@@ -34,7 +34,7 @@ static const char osd_font_pfb[] =
 ;
 
 #include "sub/ass_mp.h"
-#include "mpvcore/options.h"
+#include "options/options.h"
 
 
 #define ASS_USE_OSD_FONT "{\\fnmpv-osd-symbols}"