remove abstraction: update_head

Dependencies

• [2] 5T6SHEIT abstraction: roll forward/back
• [3] JIWWTY7R extract a function
• [4] TNRO6KLZ new live app
• [5] OI2U4SQ3 extract a function

Change contents

• replacement in main.lua at line 285
  [2.80]→[2.80:116](∅→∅)
  − app.update_head(app.Next_version)
  [2.80]

  [2.116]
  + app.Head = app.Next_version

  + love.filesystem.write('head', tostring(app.Head))
• replacement in main.lua at line 291
  [3.57]→[3.82:122](∅→∅)
  − app.update_head(app.Manifest[PARENT])
  [3.57]

  [3.143]
  + app.Head = app.Manifest[PARENT]

  + love.filesystem.write('head', tostring(app.Head))
• edit in main.lua at line 297
  [3.7619]→[3.123:229](∅→∅)
  − function app.update_head(head)

  − app.Head = head

  − love.filesystem.write('head', tostring(app.Head))

  − end

  −