hoist couple of variables out

Dependencies

• [2] EHSUSZMK more idiomatic variable names
• [3] BXYVMS4A use available variables
• [4] KTZQ57HV replace globals with args in a few functions
• [5] LF7BWEG4 group all editor globals
• [6] PJEQCTBL add state arg to Drawing.update
• [7] P5QNVXSN drop final mention of state global beyond main.lua
• [8] JFFUF5AL override mouse state lookups in tests
• [9] DRFE3B3Z mouse buttons are integers, not strings
• [10] RT6EV6OP delegate update events to drawings
• [11] UHB4GARJ left/right margin -> left/right coordinates
• [12] LAW2O3NW extract variable Margin_left
• [*] BLWAYPKV extract a module

Change contents

• edit in drawing.lua at line 244
  [4.254]

  [2.17]
  + if drawing.y == nil then

  + return -- first draw?

  + end
• edit in drawing.lua at line 248
  [2.65]

  [4.1585]
  + local mx = Drawing.coord(pmx-State.left, State.width)

  + local my = Drawing.coord(pmy-drawing.y, State.width)
• replacement in drawing.lua at line 253
  [4.433]→[3.17:155](∅→∅)
  − table.insert(drawing.pending.points, {x=Drawing.coord(pmx-State.left, State.width), y=Drawing.coord(pmy-drawing.y, State.width)})
  [4.433]

  [4.565]
  + table.insert(drawing.pending.points, {x=mx, y=my})
• edit in drawing.lua at line 255
  [4.614]→[2.140:248](∅→∅)
  − local mx,my = Drawing.coord(pmx-State.left, State.width), Drawing.coord(pmy-drawing.y, State.width)
• edit in drawing.lua at line 262
  [2.323]→[2.323:429](∅→∅)
  − local mx,my = Drawing.coord(pmx-State.left, State.width), Drawing.coord(pmy-drawing.y, State.width)