[ticket/11667] includeasset should be abstract

PHPBB3-11667
[ticket/11667] Make functions abstract in includeasset

Also comment properly

PHPBB3-11667
[ticket/11656] generate_text_for_display on memberlist.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11656
[ticket/11656] Remove line break in function call

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11656
[ticket/11656] Wrong bitwise OR

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11656
[ticket/11638] generate_text_for_display on viewtopic.php

lines: 835-843

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11638
[ticket/11638] generate_text_for_display on viewtopic.php

lines: 846-854

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11638
[ticket/11638] generate_text_for_display on viewtopic.php

lines: 1395-1403

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11638
[ticket/11638] generate_text_for_display on viewtopic.php

lines: 1403-1417

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11638
[ticket/11688] Purge TWIG cache

Purge directories
Replace opendir() with DirectoryIterator

PHPBB3-11688
[ticket/11688] tpl_ files are no longer used

Remove tpl_ and ctpl_ from cache->purge() because those prefixes
are no longer used.

PHPBB3-11688
[ticket/11639] generate_text_for_display on functions_posting.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11639
[ticket/11639] Added an useful comment.

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11639
[ticket/11639] Whitespace fixing

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11639
[ticket/11640] generate_text_for_display on functions_privmsgs.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11640
[ticket/11641] generate_text_for_display on mcp/mcp_pm_reports.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11641
[ticket/11642] generate_text_for_display on mcp/mcp_post.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11642
[ticket/11643] generate_text_for_display on mcp/mcp_queue.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11643
[ticket/11653] generate_text_for_display on mcp/mcp_topic.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11653
[ticket/11654] generate_text_for_display on mcp/mcp_warn.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11654