Certificate/wireless plugins; major refactoring

Migrate much of BI to Services.
Added Wireless Profile Provider plugin feature.
Added Certificate Authority Provider plugin feature.
Modified Certificate Provider plugin feature.
Database migration v17, for Device Profiles.
Enrolment Client Updated to support CA Certificates, Wireless Profiles
and Hardware Info.
New Client Enrolment Protocol to support new features.
Plugin Manifest Generator added to main solution.
Improved AD search performance.

Disco.Models/Repository/Device/DeviceProfile.cs

@@ -61,10 +61,14 @@ namespace Disco.Models.Repository
             return string.Format("{0} ({1})", this.Name, this.ShortName);
         }
 
-        // 2012-06-21
-        // public bool AllocateCertificate { get; set; } // Renamed from 'AllocateWirelessCertificate'
-        [StringLength(64)]
-        public string CertificateProviderId { get; set; }
+        [StringLength(200)]
+        public string CertificateProviders { get; set; }
+
+        [StringLength(200)]
+        public string CertificateAuthorityProviders { get; set; }
+
+        [StringLength(200)]
+        public string WirelessProfileProviders { get; set; }
 
         public const string DefaultComputerNameTemplate = "DeviceProfile.ShortName + '-' + SerialNumber";