adding path stroker component (work in progress)
definitions (still experimental) * src/base/fthash.c (ft_hash_remove): fixing a small reallocation bug * include/freetype/fttrigon.h, src/base/fttrigon.c: adding FT_Vector_From_Polar and FT_Angle_Diff to the trigonometric functions * include/freetype/ftstroker.h, src/base/ftstroker.c: adding path stroker component (work in progress)