Add chart, ruleset, and skin file resource importer.

Assets/Cryville/Crtr/Browsing/RulesetResourceImporter.cs

@@ -0,0 +1,20 @@
+using Newtonsoft.Json;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace Cryville.Crtr.Browsing {
+	public class RulesetResourceImporter : ResourceConverter {
+		static readonly string[] SUPPORTED_FORMATS = { ".umgr" };
+		public override string[] GetSupportedFormats() {
+			return SUPPORTED_FORMATS;
+		}
+
+		public override IEnumerable<Resource> ConvertFrom(FileInfo file) {
+			using (StreamReader reader = new StreamReader(file.FullName, Encoding.UTF8)) {
+				var data = JsonConvert.DeserializeObject<Ruleset>(reader.ReadToEnd());
+				return new Resource[] { new RulesetResource(data.name, file) };
+			}
+		}
+	}
+}