[ticket/12014] Template Event index_body.html before forumlist

Add content above the forums list (on forum index only)

PHPBB3-12014
[ticket/12014] Fix version number in event docs

PHPBB3-12014
[ticket/12014] Change event date in docs

PHPBB3-12014
[ticket/11699] Exclude build/new_version and build/old_versions from lint.

PHPBB3-11699
[ticket/11699] Properly exclude the .git directory. Namely missing dot prefix.

PHPBB3-11699
[ticket/11699] Also exclude the phpBB/cache directory.

PHPBB3-11699
[ticket/12050] Make phpbb_notification_submit_post_base abstract.

PHPBB3-12050
[ticket/11346] Hide "Mark topics read" link when forum is empty.

TOTAL_POSTS and TOTAL_USERS are not defined for viewforum.php.

PHPBB3-11346
Merge remote-tracking branch 'prototech/ticket/11346' into develop

* prototech/ticket/11346:
  [ticket/11346] Hide "Mark topics read" link when forum is empty.
Merge remote-tracking branch 'bantu/ticket/12050' into develop

* bantu/ticket/12050:
  [ticket/12050] Make phpbb_notification_submit_post_base abstract.
Merge remote-tracking branch 'bantu/ticket/11699' into develop-olympus

* bantu/ticket/11699:
  [ticket/11699] Also exclude the phpBB/cache directory.
  [ticket/11699] Properly exclude the .git directory. Namely missing dot prefix.
  [ticket/11699] Exclude build/new_version and build/old_versions from lint.
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11699] Also exclude the phpBB/cache directory.
  [ticket/11699] Properly exclude the .git directory. Namely missing dot prefix.
  [ticket/11699] Exclude build/new_version and build/old_versions from lint.
Merge remote-tracking branch 'vsephpbb/ticket/12014' into develop

* vsephpbb/ticket/12014:
  [ticket/12014] Change event date in docs
  [ticket/12014] Fix version number in event docs
  [ticket/12014] Template Event index_body.html before forumlist