start including a default_map with each app

Dependencies

• [2] JUTECG5X bring template-live's protocol in sync with template-live-editor
• [*] TNRO6KLZ new live app

Change contents

• edit in main.lua at line 254
  [2.222]

  [4.6689]
  + elseif cmd == 'DEFAULT_MAP' then

  + local contents = love.filesystem.read('default_map')

  + if contents == nil then contents = '{}' end

  + app.send(contents)