[ticket/11520] Re-adjust userpost count on topic fork

PHPBB3-11520
[ticket/11520] Coding guideline compliance

PHPBB3-11520
[ticket/11520] Re-adjust userpost count on topic fork

PHPBB3-11520
[ticket/12940] Remove unused use statements.

PHPBB3-12940
Merge pull request #2843 from bantu/ticket/12940

[ticket/12940] Remove unused use statements.
Merge pull request #2833 from Geolim4/ticket/11520

[ticket/11520] Re-adjust userpost count on topic fork
Merge branch 'develop-ascraeus' into develop