Implement resource searching and directory items.

Assets/Cryville/Crtr/Browsing/IResourceManager.cs

@@ -15,6 +15,8 @@ namespace Cryville.Crtr.Browsing {
 
 		void Activate();
 		void Deactivate();
+
+		void ApplyFilter(string filter);
 	}
 	public interface IResourceManager<out T> : IResourceManager where T : IResourceMeta {
 		new T this[int index] { get; }
@@ -23,6 +25,7 @@ namespace Cryville.Crtr.Browsing {
 		event Action DirectoryChanged;
 		IList<string> CurrentDirectory { get; }
 		void ChangeDirectory(IEnumerable<string> dir);
+		bool IsDirectory(int index);
 		void OpenDirectory(int index);
 		void ReturnToDirectory(int index);
 	}