Fixes #7925. a) change CWD during split reduced to splitting only. b) fixed problem in mkDirParent() with absolute paths, c) make logger independent of CWD, d) fixed problem with `mktemp --tmpdir`(difference Ubuntu 16 / 18) by using PHP function, e) fixed some 'undefined index' problems

Refs #7743. Move error mesages to Constants.php. Unit tests use those constants now. 'data-pattern-error' only delivered if a 'pattern' is given. 'required' attribute only delivered is set.

Refs #7743. Detection of 'pattern error' on per QFQ default, custom instance wide, per form or per FormElement - per FormElement overwrites other. System specific generated overwrites QFQ static default, instance wide default. Move default pattern to constants.

Refs #7743. Add unit tests. Make default error text more specific (only if default error text is not explicit set in config, form or form-element)

Redesing FormEditor: FormElement as second pill. Hide MultiForm as long as it not active. Rename Various to Layout.

Fixes #7603: Unit test if DatabaseUpdate() plays well. Especially that formEditor.sql is running fine.

Fixed missing $formElement[FE_DECIMAL_FORMAT]. Add 'missing primary record' check. Fixed missing fe['id'].

Fix PHPUnit tests