some minor cleanup

Dependencies

• [2] GFXWHTE6 mouse wheel support
• [3] 2L5MEZV3 experiment: new edit namespace
• [4] KKMFQDR4 editing source code from within the app
• [5] OI4FPFIN support drawings in the source editor
• [6] KMSL74GA support selections in the source editor
• [7] 2CK5QI7W make love event names consistent
• [8] LNUHQOGH start passing in Editor_state explicitly

Change contents

• replacement in source_edit.lua at line 314
  [2.220]→[2.220:227](∅→∅)
  − else
  [2.220]

  [2.227]
  + elseif dy < 0 then
• replacement in run.lua at line 166
  [3.183379]→[2.657:692](∅→∅)
  − function run.mouse_wheel_move(x,y)
  [3.183379]

  [2.692]
  + function run.mouse_wheel_move(dx,dy)
• replacement in run.lua at line 168
  [2.766]→[2.766:816](∅→∅)
  − return edit.mouse_wheel_move(Editor_state, x,y)
  [2.766]

  [2.816]
  + return edit.mouse_wheel_move(Editor_state, dx,dy)
• replacement in log_browser.lua at line 271
  [2.1272]→[2.1272:1279](∅→∅)
  − else
  [2.1272]

  [2.1279]
  + elseif dy < 0 then
• replacement in edit.lua at line 313
  [2.2073]→[2.2073:2080](∅→∅)
  − else
  [2.2073]

  [2.2080]
  + elseif dy < 0 then