Add disable send policy (#1130)

* Add Disable Send policy

* Test DisableSend policy

* PR Review

* Update tests for using CurrentContext

This required making an interface for CurrentContext and mocking out
the members used. The interface can be expanded as needed for tests.

I moved CurrentContext to a folder, which changes the namespace
and causes a lot of file touches, but most are just adding a reference

* Fix failing test

* Update exemption to include all exempt users

* Move all CurrentContext usages to ICurrentContext

* PR review. Match messaging with Web

src/Core/Context/ICurrentContext.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Security.Claims;
+using System.Threading.Tasks;
+using Bit.Core.Enums;
+using Bit.Core.Models.Table;
+using Bit.Core.Repositories;
+using Microsoft.AspNetCore.Http;
+
+namespace Bit.Core.Context
+{
+    public interface ICurrentContext
+    {
+        HttpContext HttpContext { get; set; }
+        Guid? UserId { get; set; }
+        User User { get; set; }
+        string DeviceIdentifier { get; set; }
+        DeviceType? DeviceType { get; set; }
+        string IpAddress { get; set; }
+        List<CurrentContentOrganization> Organizations { get; set; }
+        Guid? InstallationId { get; set; }
+        Guid? OrganizationId { get; set; }
+
+        Task BuildAsync(HttpContext httpContext, GlobalSettings globalSettings);
+        Task BuildAsync(ClaimsPrincipal user, GlobalSettings globalSettings);
+
+        Task SetContextAsync(ClaimsPrincipal user);
+
+
+        bool OrganizationUser(Guid orgId);
+        bool OrganizationManager(Guid orgId);
+        bool OrganizationAdmin(Guid orgId);
+        bool OrganizationOwner(Guid orgId);
+        bool OrganizationCustom(Guid orgId);
+        bool AccessBusinessPortal(Guid orgId);
+        bool AccessEventLogs(Guid orgId);
+        bool AccessImportExport(Guid orgId);
+        bool AccessReports(Guid orgId);
+        bool ManageAllCollections(Guid orgId);
+        bool ManageAssignedCollections(Guid orgId);
+        bool ManageGroups(Guid orgId);
+        bool ManagePolicies(Guid orgId);
+        bool ManageSso(Guid orgId);
+        bool ManageUsers(Guid orgId);
+
+        Task<ICollection<CurrentContentOrganization>> OrganizationMembershipAsync(
+            IOrganizationUserRepository organizationUserRepository, Guid userId);
+    }
+}