Add category to OperationInfo

[kavics]

Copy SnCategory information to the new Category property of the OdataOperationAttribute:

...
/// </summary>
/// <snCategory>Collaboration</snCategory>          <--- source
[ODataAction(Category = "Collaboration", ...)]      <--- target
...

Extend the "help/operations" function's result with the new property.

{
  "Controller": "",
  "Category": "???"      <--- new property
  "Signature": "CheckOut() : void",
  "Kind": "Action",
  "ContentTypes": "GenericContent",
  "Roles": "Everyone",
  "Permissions": "Save",
  "Policies": "VersioningAndApproval",
  "Scenarios": "ListItem, ExploreActions, ContextMenu"
},

Categorize the following operations:

• GetCurrentUser()
• GetFeatures()
• GetMultiFactorAuthenticationInfo()
• GetOperations()
• GetReplicationTemplate()
• GetResourceClass(string className, string langCode)
• GetSettings(string name, string property?)
• Replicate(string target, ReplicationDescriptor options)
• ResetTwoFactorKey()
• WriteSettings(string name, object settingsData)