Merge lines.love

Dependencies

• [2] MD3W5IRA new fork: rip out drawing support
• [3] ELJNEPW2 simplify cursor-on-screen check
• [4] 2L5MEZV3 experiment: new edit namespace
• [5] LNUHQOGH start passing in Editor_state explicitly
• [6] WJBZZQE4 fold together two largely similar cases

Change contents

• resurrect zombie in edit.lua at line 103
  [4.5853]→[2.9659:9790](∅→∅),[4.5853]→[2.9659:9790](∅→∅)
  + y, State.screen_bottom1.pos = Text.draw(State, line_index, y, startpos)

  + y = y + State.line_height

  + --? print('=> y', y)