[ticket/11724] Support "ELSE IF" and "ELSEIF" in the same way

PHPBB3-11724
[ticket/11724] Replace spaces with tabs

PHPBB3-11724
[ticket/11813] Change mock auth provider to implement base provider

PHPBB3-11813
[ticket/11724] Handle ELSE IF separately

PHPBB3-11724
Merge remote-tracking branch 'EXreaction/ticket/11724' into develop

* EXreaction/ticket/11724:
  [ticket/11724] Handle ELSE IF separately
  [ticket/11724] Replace spaces with tabs
  [ticket/11724] Support "ELSE IF" and "ELSEIF" in the same way
Merge remote-tracking branch 'Hardolaf/ticket/11813' into develop

* Hardolaf/ticket/11813:
  [ticket/11813] Change mock auth provider to implement base provider
Merge branch 'develop' of github.com:phpbb/phpbb3 into ticket/11768
[ticket/11768] Updated composer.lock

PHPBB3-11768