CRM-15854 - CiviMail workflow, old UI - Consistent interpretation of 'access CiviMail'

CRM-15854 - CiviMail workflow, old UI - Consistent interpretation of 'access CiviMail'

There are inconstencies in how permissions are interpreted:
 1. Some parts of the UI treat 'access CiviMail' as an overarching permission
    (which implies create+schedule+approve mailings) and treat
    create+schedule+approve as standalone permissions.
 2. Other parts treat 'access CiviMail' as a pre-requisite for create+schedule+approve.

This revision updates various legacy UI's to consistently use the first approach.