[ticket/12930] core.ucp_pm_compose_compose_pm_quotepost_query_after

Adding the core.ucp_pm_compose_compose_pm_quotepost_query_after
event to ucp backend.

PHPBB3-12930
[ticket/12930] Update to RC4

PHPBB3-12930
[ticket/12930] Adding more variables to the event

More variables, according to comments, were added to the event.

PHPBB3-12930
[ticket/12930] Fixing event comment block and variable

According to comments on pull request

PHPBB3-12930
[ticket/12930] BUMP to RC5

PHPBB3-12930
Merge pull request #2828 from brunoais/ticket/12930

[ticket/12930] core.ucp_pm_compose_compose_pm_quotepost_query_after