[ticket/11916] Remove files from hidden attach list after deletion

The hidden attachment_data list needs to be updated if a file got removed.
This was not done until now and caused a general error after submitting a
post if a file was removed after uploading it.

PHPBB3-11916
Merge remote-tracking branch 'Marc/ticket/11916' into develop

* Marc/ticket/11916:
  [ticket/11916] Remove files from hidden attach list after deletion
[ticket/11872] Template syntax typos in oauth templates

PHPBB3-11872
Merge remote-tracking branch 'cyberalien/ticket/fixes-only/11872' into develop

* cyberalien/ticket/fixes-only/11872:
  [ticket/11872] Template syntax typos in oauth templates
[ticket/11138] Increase AJAX timeout period to 15 seconds.

PHPBB3-11138
[ticket/11138] Do not use AJAX for ACP resync features.

PHPBB3-11138
Merge remote-tracking branch 'prototech/ticket/11138' into develop

* prototech/ticket/11138:
  [ticket/11138] Do not use AJAX for ACP resync features.
  [ticket/11138] Increase AJAX timeout period to 15 seconds.
  [ticket/11872] Template syntax typos in oauth templates
[ticket/11956] Responsive AJAX alerts

PHPBB3-11956
[ticket/11956] Add assets_version to responsive.css link

PHPBB3-11556
[ticket/11956] Fix member list page

PHPBB3-11956
[ticket/11956] Scale down large avatars

Prevent large avatars from breaking layout on any resolution.

PHPBB3-11956
[ticket/11956] Scale down online image for HD display

Scale down online image for HD displays

PHPBB3-11956
[ticket/11956] Hide author on mobile devices

Hide duplicate author name in posts on mobile devices

PHPBB3-11956
[ticket/11956] Fix responsive jumpbox

PHPBB3-11956
[ticket/11956] Fix topic actions layout

Fix topic actions layout on mobile devices

PHPBB3-11956
[ticket/11956] Fix errors in drafts.html

PHPBB3-11956
[ticket/11956] Move responsive *CP navigation

Move responsive *CP navigation to cp.css because
layout has to change at width higher than 700px

PHPBB3-11956
[ticket/11956] Adjustments to responsive topiclist lists

Changes behavior of topiclist lists on mobile devices.
Shows/hides certain elements in each row to present all
important information to visitor on mobile devices, such
as last post when viewing forum instead of first post.

Also fixes topiclist layout bug in drafts.html

PHPBB3-11956
[ticket/11956] Move JS to reusable function

Move JS to reusable function that can be ran
for all content added with JavaScript such as
results of AJAX forms

PHPBB3-11956
[ticket/11956] Put top navigation in one block

PHPBB3-11956