#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.

PROTOCOL.md: added 'the attribute' in one sentence

#3253: STORE_TYPO3: steht waehrend Update / Save nicht zur Verfuegung - wird aber benoetigt. Bsp: feUser, beUser, pageId, ...

CODING.md: described implementation.
Store.php: fixed setting of STORE_SYSTEM / showDebugInfo during API call.

Coding.md: Beschreibung in Deutsch wie die Formularelemente , rekursiv, gerendert werden.
AbstractBuildForm.php: new function buildTemplateGroup()
BuildFormBootstrap.php, BuildFormPlain.php, BuildFormTable.php: Preparation for new optional TemplateGroup wrap.
QuickFormQuery.php: update comments.
formEditor.sql: column 'type' definition extended - new 'templateGroup' enum. FormElement 'type' updated to new container element 'templateGroup'

Support.php, AbstractBuildForm.php: new function falseemptyToZero().
Constants.php: New UPLOAD_MODE_*
Evaluate.php: fixed bug in 'skip' logic of evaluate->parseArray()
Save.php: doUpload() now returns $modeUpload, which are needed in doUploadSlave(), rewrote logic of doUploadSlave(),

CODING.md: update docs for situation 'new record already saved'.
FillStoreForm.php: In case of form load with r=0, the submitted form element names are does not contain the effective record id - workaround implemented.
Session.php: refactored clear(), create unsetItem().
Sip.php: new buildParamStringFromArray(), updateSipToSession().
Store.php: For r=0 SIPs always add a uniqe parameter.
AbstractBuildForm.php: modified message for subrecords on new record.
QuickFormQuery.php: create unique SIP on form load.

extension/Documentation/_make/conf.py: bumped versiont to 0.4

CODING.md: edited to be more clearly.
AbstractBuildForm.php: doc
Save.php: If there is no upload, do not save the filename again (which needs to be calculated instead of using the sip)