textshaping 0.4.1

• Make compiled code somewhat less assumptive about the correctness of the input
• Fix a bug from too agressive early exiting shaping of strings with no max
  width (#45)
• Fixed a mismatch between the default values of the width argument in
  shape_text() and systemfonts::match_fonts() (#44)
• Updated text_width() to take the same inputs as shape_text()