Add project files.

Assets/Cryville/Common/StringUtils.cs

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+using System;
+using System.Text;
+
+namespace Cryville.Common {
+	public static class StringUtils {
+		public static string TrimExt(string s) {
+			return s.Substring(0, s.LastIndexOf("."));
+		}
+		public static string ToString(this TimeSpan timeSpan, int digits) {
+			var b = new StringBuilder();
+			bool flag = false;
+			if (timeSpan.TotalDays >= 1) {
+				flag = true;
+				b.Append(timeSpan.Days.ToString() + ":");
+			}
+			if (flag || timeSpan.TotalHours >= 1)
+				b.Append((timeSpan.Hours % 24).ToString() + ":");
+			b.Append((timeSpan.Minutes % 60).ToString("00") + ":");
+			b.Append((timeSpan.TotalSeconds % 60).ToString("00." + new string('0', digits)));
+			return b.ToString();
+		}
+	}
+}