[feature/editor-code-tabs] Allow tabs when typing code

Allow tabs when typing code in textarea
Keep indentation when typing code in textarea

PHPBB3-11557
[ticket/11558] Fix styling for notifications link

PHPBB3-11558
[ticket/11558] Adjustments for notification link

PHPBB3-11558
[feature/editor-code-tabs] Correctly calculate end tag location

PHPBB3-11557
[feature/editor-code-tabs] Adjust code style to match guidelines

PHPBB3-11557
Merge remote-tracking branch 'remotes/cyberalien/ticket/11558' into develop

# By Vjacheslav Trushkin
# Via Vjacheslav Trushkin
* remotes/cyberalien/ticket/11558:
  [ticket/11558] Adjustments for notification link
  [ticket/11558] Fix styling for notifications link
[ticket/11551] Fix error in system tab if get_remote_file returns empty string

Currently a debug error is thrown. With this patch, it fails without keeping
the admin from being able to access the rest of the System modules by showing
a nicer error "Failed to obtain latest version information."

PHPBB3-11551
[ticket/11010] adding new input types into build_cfg_template()

PHPBB3-11010
[ticket/11010] changing email and url input types in php files

PHPBB3-11010
[ticket/11010] adding type="number" in ACP; adding type="email" in install

PHPBB3-11010
[ticket/11010] Changing email and url input types in prosilver templates

PHPBB3-11010
[ticket/11010] Changing email and url input types in subsilver2 templates

PHPBB3-11010
[ticket/11010] yahoo and msn user search fields changed to email input type

PHPBB3-11010
[ticket/11010] Changing email and url types in adm templates

PHPBB3-11010
[ticket/11010] fixing problems with 4th parameter in number type

PHPBB3-11010
[ticket/11010] adding type="number" to CPF int type

PHPBB3-11010
[ticket/11010] adding type="number" to inputs in functions_profile_fields.php

PHPBB3-11010
[ticket/11010] adding type="number" and type="date" to prosilver

PHPBB3-11010
[ticket/11010] adding type="number" to subsilver2
and removing it from prosilver wher it should not be.

PHPBB3-11010
[ticket/11010] fixing inputs types in memberlist_search.html

PHPBB3-11010