Implements #9679: formModeGlobal is now also used via STORE_USER - set formModeGlobal systemwide for a specific user (session).

Implements #9617. a) formModeGlobal=requiredShowOnly set's the form attribute. The new STORE_VAR 'allRequiredGiven' is set

Refs #8204. Copy requiredPosition from Form to FormElement has been moved from 'formElementSetDefault()' to 'copyAttributesToFormElements()'

Fixes #7864. 'required'-FE Elements, deactivated via formModeGlobal=requiredOff, now gets class 'required-field'. The final 'required' mode is still temporarily disabled.

Fixes #7620. Label align left/center/right. Defined by config/form/formelement. FormEditor slightly redesigned.

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

B3613 - Only render label/input/note open/close tag when corresponding checkbox in FE configuration is ticked. - refs #3613, closes #3613

F6289: show debug button for 'All' and 'Per session'. Remove expired logfiles. Set new form variables FORM_LOG_FILE_ALL, FORM_LOG_FILE_SESSION.

F6289: First runnable version to show the formLog. Log is still empty (nothing submitted). 'per session' / 'all' not implemented.