Merge lines.love

Dependencies

• [2] J6UWSVHB bugfix: window title
• [3] 7VGDIPLC more robust state validation
• [4] KKMFQDR4 editing source code from within the app
• [5] 2CK5QI7W make love event names consistent

Change contents

• edit in run.lua at line 35
  [4.179133]→[2.129:202](∅→∅)
  − love.window.setTitle('lines-and-links.love - '..Editor_state.filename)
• resurrect zombie in run.lua at line 35
  [4.179133]→[3.16:48](∅→∅),[4.179133]→[3.16:48](∅→∅)
  + edit.check_locs(Editor_state)
• edit in run.lua at line 36
  [3.48]

  [4.179196]
  + love.window.setTitle('lines-and-links.love - '..Editor_state.filename)
• edit in run.lua at line 112
  [4.182229]→[2.203:276](∅→∅),[4.182229]→[2.203:276](∅→∅)
  − love.window.setTitle('lines-and-links.love - '..Editor_state.filename)
• resurrect zombie in run.lua at line 112
  [4.182195]→[3.49:81](∅→∅),[4.182195]→[3.49:81](∅→∅)
  + edit.check_locs(Editor_state)
• edit in run.lua at line 113
  [3.81]

  [4.182292]
  + love.window.setTitle('lines-and-links.love - '..Editor_state.filename)