Add project files.

Assets/Cryville/Common/ComponentModel/PrecisionAttribute.cs

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+using System;
+
+namespace Cryville.Common.ComponentModel {
+	[AttributeUsage(AttributeTargets.Property, Inherited = false)]
+	public class PrecisionAttribute : Attribute {
+		public PrecisionAttribute(double precision) {
+			Precision = precision;
+		}
+
+		public double Precision { get; set; }
+	}
+}