Allow Activity + Contact Profiles to be edited and viewed using profile permissions

This issue is related to CRM-8148

We currently only allow Contact Profiles to be created/edited/viewed by the end user (with the right permission). This feature will extend the edit/view functionality to activities also. (Note that we are not handling create). A few things to handle:

1. The Profile View/Edit code should allow this if

• The contact has permission to edit/view their own record
• The contact has the profile edit/view permissions
• There is an activity ID associated with the GET request

2. Survey has a lot of the same code (definitely for editing) in the batch update widget. Please use the API created by this issue: CRM-8148 and centralize the two code bases

3. Check and ensure that create profile (profile/create) returns an error if a profile with both contact and activity fields is requested:
"Profiles which contain activity fields can only be used to edit existing records."

4. We should be able to handle

• All Contact fields in profile including custom fields
• All Activity fields in profile including custom fields

5. We will need to validate the profile fields as they're added to the profile to ensure that they don't contain a mix of custom fields used for different activity types (e.g. profile can't contain a field bound to a custom field used for Activities::Surveys AND a field bound to custom field used for Activities::Meetings). An API will be created for this (CRM-8148).