DRAGANDDROP.md, PROTOCOL.md: Doc for "drag'n' drop" implementation.
dragAndDrop.php: API endpoint
DragAndDrop.php: Class for implementing drag'n' drop functionality.
Link.php: implement new renderMode=8 - returning only the sip.
QuickFormQuery.php: New entry point for processing "drag'n' drop".

Buf #4257 / Dynamic update broken - after changing JSON data structure, update load.php has been missed.

file.php, load.php, Html2Pdf.php: minor updates.
Dirty.php, QuickFormQuery.php: optional $lockTimeout as parameter during instantiating. Return $lockTimeout where necessary. Otherwise read qfq.config.ini. Refactor process(), acquireDirty(), checkDirtyAndRelease().

load.php: Dynamic Update has been broken since implementing of 'element-update' (#3180). Now both methods, 'element-update' and 'form-update' should be fine.

#3180=#2081 dynamicUpdate, rearrange 'input hidden' elements from checkboxes, radios to top of form.

CODING.md: add some doc about STORE_ADDITIONAL_FORM_ELEMENTS.
load.php (#2081): rearrange delivered JSON to fullfill client API.
AbstractBuildForm.php: rename getJsonElementUpdate() to getFormElemenForJson(). Extend getFormElementForJson() to support changes for label and note. Fill store STORE_ADDITIONAL_FORM_ELEMENTS with 'hidden input' elments.
QuickFormQuery.php: implement Client JOSN API update.

load.php: implemented
FillStoreForm.php: implemented
Store.php: phpunit test complains about 'store already filled'. Option set to explicitly allow rewrite.
AbstractBuildForm.php: Added new mode 'FORM_UPDATE'. Elements additionaly create json code. 'data-load' attribute will be added to form elements, if 'dynamicUpdate=yes'
  elements(): added call by reference parameter $json, to return the generated json code.
BodyTextParse.php: added 'r =' as a new 'start new line' indicator. This was necessary at least for phpunit tests to run.
BuildFormBootstrap.php: buildPill() passes json data structure.
BuildFormPlain, BuildFormTable.php: doSubrecords()  passes json data structure.
Constants.php: New FORM_UPDATE, SQL_FORM_ELEMENT_SIMPLE_ALL_CONTAINER, ERROR_FORM_NOT_FOUND, API_FORM_UPDATE
Evaluate.php: Exception text enhanced.
QuickFormQuery.php: FillStoreForm.php included. Automatic detection of FORM_LOAD and FORM_SAVE removed. Instead the mode are given explicitly. mode=FORM_UPDATE implemented.
Save.php: added TODOs in code.
formEditor.sql: reformat code. Add 'FormElement.dynamicUpdate'. 'FormElemente.checkType': 'number' replaced by 'digit'. Added 'alnumx', 'digit'. Form 'form', 'formElement': output of 'title' replaced by 'name' - outputting 'title' confuses the user (tries to show records which do fit to the formEditor) and might produce recursion in evaluation (did not understand why, but happens). FormEditor: implemented 'dynamicUpdate', escpecially the 'type' select list will be adjusted dynamically.

BuildFormBootstrap: Save Button prepared.
AbstarcFromBuild: form.id specified