Refs #4018: Implement renamed keywords _ta_query, _ta_prefetch. Fix broken detection of typeahead mode.

Implemented new php unit tests for encryption feature. Customized old unit tests to get them ready and work for the new feature (testConfigIniDefaultValues, TestFormEditor.sql). And corrected some typo.

QFQ encrypt/decrypt WIP: Feature implementation for Forms and Report finished. QFQ Variables are in progress

#Refs 13722: Detect and fix pdfunite problems "Gen inside xref table too large (bigger than INT_MAX)" via pdf2ps, ps2pdf

S13679 Multiple changes in php and js to get tablesorter-view-saver work in subrecord. Implemented new parameter for subrecord to give own attributes. Selecting views or columns doesn't impact browser history and record lock anymore. Only saving a new view or deleting an existing view still impacts browser history (but not record lock), It's impossible to prevent it because we need the page reload to get new existing views after deleting or saving a new one.

F10096. Datetimepicker expanded function with own parameter keys and corrected default dateFormat string.

WIP #F10715 - a first version wihth " 'd|s:1|t:qfqpdf: JES|u:jes.math.uzh.ch/?--scale=0.5|M:qfqpdf' AS _link" works

Refs #12615. Implements silent HEIC/HEIF conversion to png. Write a note in realease notes, to install 'libheif-examples'.

Fixed a lot of unit tests, which did not passed on webwork16/crose/qfq. In test hardcoded 'http://xxxxxxxxxxxxxxxxxxxxxxxxxxxx/qfq/' makes trouble. CR did not find the place (qfq.json baseUrl tried) to adjust for phpUnit Tests.

REST.rst: Add example with `x-Api-Key`. Add 'x-Api-Key' as processed header. Strip white spaces from value.

Fixes #11265. Checked for BS and plain, active & disabled, with or without glyph. Code refactored to use more of Link class.

WIP: DD wird noch span gewrapped. Ab jetzt Umstellung auf "renderLink wird nicht rekursiv aufgerufen".

WIP: es wird nur noch ein 'class' attribute gerendert:ok. Next Task: alles mit div wrappen, anstatt <span>