helper: trimming whitespace from strings

Dependencies

• [2] TGHAJBES use line cache for drawings as well
• [*] BULPIBEG beginnings of a module for the text editor
• [*] PLKNHYZ4 extract a function

Change contents

• edit in text.lua at line 992
  [2.1777]

  [5.438]
  + end

  +

  + function trim(s)

  + return s:gsub('^%s+', ''):gsub('%s+$', '')

  + end

  +

  + function ltrim(s)

  + return s:gsub('^%s+', '')

  + end

  +

  + function rtrim(s)

  + return s:gsub('%s+$', '')