more decoupling editor tests from App

Dependencies

• [2] 7XERS4UF more decoupling editor tests from App
• [3] CIQN2MDE bugfix: typing a capital letter deletes selection
• [*] LXTTOB33 extract a couple of files

Change contents

• replacement in text_tests.lua at line 538
  [2.95]→[3.487:508](∅→∅),[3.487]→[3.487:508](∅→∅)
  − App.textinput('D')
  [2.95]

  [2.96]
  + edit.textinput(Editor_state, 'D')