[OE-4389] Cancel button should not be greyed out when clicked

This is now consistant with other "cancel" buttons throughout the site.
[OE-4391] Check the session for allowed amount of max_procedures, set status to "full"
[OE-4393] Adjusted colours in booking calendar
Merge branch 'feature/RTT' into release/1.7

Conflicts:
	assets/css/module.css