Add header to Try-It

Urgent bugfix
Fix regressions caused by commit c7265f2
conflict
Merge branch 'master'

Conflicts:
	database.php
	include/header.php
Merge branch 'ThemeDB'

Conflicts:
	css/style.css
	database.php
please work

I’m tired of conflicts
Styling, fix bad header
MySQL->PDO
make titles in header links
Styling for Try-It
added db-success

added db-success
fixed a notification:before issue
Merge branch 'Overall-Notificaiton'

Conflicts:
	css/style.css
	include/header.php
Whitespace
Preliminary changes
Filter fields to avoid XSS

Yes, it is a real threat, especially since no filtering goes pre-
insertion. We are fine on SQLi though.
strip tags
Merge branch 'Notifications'
moderator permissions

add moderator abilities
Merge branch 'Notifications'
Fix header