clean up some final bifold code

Dependencies

• [2] OI4FPFIN support drawings in the source editor
• [3] KKMFQDR4 editing source code from within the app

Change contents

• replacement in source_undo.lua at line 64
  [2.1590]→[2.1590:1671](∅→∅)
  − table.insert(event.lines, {mode='text', data=line.data, dataB=line.dataB})
  [2.1590]

  [2.1671]
  + table.insert(event.lines, {mode='text', data=line.data})
• edit in source_file.lua at line 2
  [3.150297]→[3.150297:150344](∅→∅)
  −

  − Fold = '\x1e' -- ASCII RS (record separator)
• replacement in source_file.lua at line 29
  [3.151134]→[2.12114:12389](∅→∅)
  − local line_info = {mode='text'}

  − if line:find(Fold) then

  − _, _, line_info.data, line_info.dataB = line:find('([^'..Fold..']*)'..Fold..'([^'..Fold..']*)')

  − else

  − line_info.data = line

  − end

  − table.insert(result, line_info)
  [3.151134]

  [3.151164]
  + table.insert(result, {mode='text', data=line})
• edit in source_file.lua at line 49
  [2.12550]→[2.12550:12667](∅→∅)
  − if line.dataB and #line.dataB > 0 then

  − outfile:write(Fold)

  − outfile:write(line.dataB)

  − end
• replacement in source_file.lua at line 138
  [2.15917]→[2.15917:16102](∅→∅)
  − if line:find(Fold) then

  − _, _, line_info.data, line_info.dataB = line:find('([^'..Fold..']*)'..Fold..'([^'..Fold..']*)')

  − else

  − line_info.data = line

  − end
  [2.15917]

  [2.16102]
  + line_info.data = line