add commconnect-only view of HQ

interdependent with https://github.com/dimagi/hsph-reports/pull/34

see https://trello.com/c/P0LDpMXp/165-commconnect-only-view-of-hq-without-commcare

this adds a CommConnect Enabled domain setting which, when checked, causes the following changes:

- hide cloudcare tab
- hide manage deployments reports
- move messaging reports to the top and rename to CommConnect
- rename Applications tab to Surveys

This also has the following changes for all domains:
- rename Messages tab to Messaging and get rid of reminders tab (which was exposed for commtrack domains)
- expose reminders pages on messaging tab for all domains
- expose survey pages on messaging tab for survey management-enabled domains