* set these to RES_TXTATR_INPUTFIELD so they get a SwTextInputField
* only for string fields, the numeric ones break when editing
* SwCursorShell::CursorInsideInputField() must check type of the hint,
  not type of the field
* DocumentFieldsManager::UpdateExpFieldsImpl() is called with one field
  when it is inserted, and must expand the field into the SwTextNode then,
  and it's called when the user edits inside the field, and must *not*
  expand the field into the SwTextNode then
* SwDocUpdateField::MakeFieldList_() must iterate RES_TXTATR_INPUTFIELD
* SwEditWin::MouseButtonDown() must still pop up the edit dialog on
  double-click
* SetFieldsDirty() should check RES_TXTATR_INPUTFIELD because SwGetExp
  may depend on them
* a very odd API design: SwSetExpField::PutValue() allows to change the
  "InputFlag", which is actually used by the ODF import!
  This needs some alchemy to convert between SwTextField and
  SwTextInputField hints, see SwXTextField::TransmuteLeadToInputField().
* etc.

Change-Id: I45c471703f102ebcb04b8567f9d76c17d5a063e7
Co-authored-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
Reviewed-on: https://gerrit.libreoffice.org/69414
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>