basic readonly scripting support for account, feed, folder

Evergreen/Scriptability/ScriptingObject.swift

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+//
+//  ScriptingObject.swift
+//  Evergreen
+//
+//  Created by Olof Hellman on 1/10/18.
+//  Copyright © 2018 Olof Hellman. All rights reserved.
+//
+
+import Foundation
+
+protocol ScriptingObject {
+    var objectSpecifier: NSScriptObjectSpecifier?  { get }
+    var scriptingKey: String { get }
+}
+
+protocol NamedScriptingObject: ScriptingObject {
+    var name:String { get }
+}
+
+protocol UniqueIdScriptingObject: ScriptingObject {
+    var scriptingUniqueId:Any { get }
+}