F7904 rest api export via form

See merge request !126

Refs #7634. Refactor. REST form/id's are now in STORE_CLIENT. Unit Tests will fail - not updated to new function.

B7634 session timeout zu kurz

See merge request !125

Refs #7634. Session Timeout zu kurz. Add logout of FE user. Logout happens not directly on the first call, but on the second or third page access.

B7634. Fixes #7634. Session Timeout zu kurz. The bug was probably not a bug, but a too short timeout together with an misleading exception (logout and in - but reload the page also leads to valid page). The fix is 'take the system default (php.ini) and set that one'.

Fixes #7864. 'required'-FE Elements, deactivated via...

See merge request !124

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

B7848 extraColumName 'paged' - easier handling in case 'r=0' or empty 'U:...' - fixes #7848

See merge request !123

F7165 fe user registration

See merge request !122

Bug: die Hashes aendern sich jedesmal - einloggen mit dem neuen PW ist nicht moeglich

This reverts commit d2054269