bugfix: up/down across drawings

Dependencies

• [2] PRPPZGDY speed up some obvious common cases
• [*] OTIBCAUJ love2d scaffold
• [*] RJGZD4IN binary search to most natural up/down with proportional fonts

Change contents

• edit in main.lua at line 713
  [5.588]

  [5.588]
  + if type(line) == 'table' then return 0 end
• edit in main.lua at line 720
  [2.200]

  [5.820]
  + if type(line) == 'table' then return hint end