[ticket/11663] Make generate_text_for_storage return the errors.

generate_text_for_storage does not return anything, all returned values are outputted using the parameters so this uses the returned value with the same idea as many C language functions where the returned value is if all went well or not and if it didn't what went wrong.

PHPBB3-11663
[ticket/11663] Add the doc block about the return value.

generate_text_for_storage does not return anything, all returned values are outputted using the parameters so this uses the returned value with the same idea as many C language functions where the returned value is if all went well or not and if it didn't what went wrong.

PHPBB3-11663
[ticket/11663] Add the doc block about the parameters.

PHPBB3-11663
[ticket/11924] Bring layout of events.md to one style

PHPBB3-11924
[ticket/11924] Add script to export events.md with wiki markup

PHPBB3-11924
[ticket/11924] Add version info of template events to events.md

PHPBB3-11924
[ticket/11924] Reduce unneccessary load

PHPBB3-11924
[ticket/11924] Add option to export php event list

PHPBB3-11924
[ticket/11924] Fix some minor issues with the php event docs

PHPBB3-11924
[ticket/11924] Remove duplicated code

PHPBB3-11924
[ticket/11280] Prevent duplicate entry in forums_track table.
Enforcing a time limit prevents all rows from being selected, thus a new row
is inserted resulting in a duplicate entry.

PHPBB3-11280
[ticket/11899] Give indication of activity after voting in poll.

PHPBB3-11899
[ticket/11935] Fix <p> tags not allowed inside <strong> tags

PHPBB3-11935
[ticket/11935] Fix incorrect alt tags that should be title tags

PHPBB3-11935
[ticket/11935] Fix stray </a> tags

PHPBB3-11935
[ticket/11935] Fix invalid HTML usage of <label> tag in prosilver

PHPBB3-11935
[ticket/11935] Remove obsolete table attributes from Prosilver

cellpadding, cellspacing, border are obsolete table attributes.
They are handled by CSS already using table and .table1

PHPBB3-11935
[ticket/11935] Replace obsolete table attributes in Admin with CSS

PHPBB3-11935
[ticket/11935] Tweak colour swatch table

PHPBB3-11935
Merge branch 'develop' into ticket/11935