[ticket/9550] Add template event viewtopic_body_top_profile_icons_prepend

Adds the prepend counterpart of a template event required for the karma
extension. It allows adding profile icons to posts.

Explanation from http://area51.phpbb.com/phpBB/viewtopic.php?f=111&t=44379:
Per suggestion of nickvergessen, add a counterpart for every append or prepend
event.

PHPBB3-9550
[ticket/9550] Add template event viewtopic_body_postprofile_append

Adds a template event required for the karma extension. It allows adding data
under the username and avatar next to every post.

Explanation from http://area51.phpbb.com/phpBB/viewtopic.php?f=111&t=44379:
Used by the karma extension to add a karma score indication that allows users
to see how respected the post author is.

PHPBB3-9550
[ticket/9550] Add template event viewtopic_body_postprofile_prepend

Adds the prepend counterpart of a template event required for the karma
extension. It allows adding data under the username and avatar next to every
post.

Explanation from http://area51.phpbb.com/phpBB/viewtopic.php?f=111&t=44379:
Per suggestion of nickvergessen, add a counterpart for every append or prepend
event.

PHPBB3-9550