- Adds support for word wrapping to Blender's BLF font library. - Splits lines when width limit is reached or on explicit \n newlines. Details: - Word wrapping is used when `BLF_WORD_WRAP` flag is enabled. - There is a single loop to handle line wrapping, this runs callback, passing in a substring, this way we can avoid code-duplication for all word-wrapped versions of functions... OR... avoid having to add support for word-wrapping directly into each function. - The `ResultBLF` struct was added to be able to get the number of wrapped lines, when calling otherwise unrelated functions such as `BLF_draw/BLF_width/BLF_boundbox`, which can be passed as the last argument to `BLF_*_ex()` functions. - The `ResultBLF` struct is used to store the result of drawing (currently only the number of lines wrapped, and the width).