[ticket/11552] Compact mode for notifications and pm links

This will hide part of buttons for notifications and pm links
in header before switching to responsive mode

PHPBB3-11552
[ticket/11552] Break long words

Something that should have been added long time
ago, but was not an issue until responsive design

PHPBB3-11552
[ticket/11552] Fixes for auto-resize textarea

Changing auto-resize code to work with all possible
box-sizing and checking for negative height.

PHPBB3-11552
[ticket/11552] Responsive forms

PHPBB3-11552