将Feature/XP.Common和Feature/XP.Hardware分支合并至Develop/XP.forHardwareAndCommon，完善XPapp注册和相关硬件类库通用类库功能。

XP.Hardware.RaySource.Comet.Messages/Commands/SetCurrentCommand.cs

@@ -0,0 +1,15 @@
+namespace XP.Hardware.RaySource.Comet.Messages.Commands
+{
+    /// <summary>
+    /// 设置电流命令
+    /// </summary>
+    public class SetCurrentCommand : RaySourceCommand
+    {
+        public override string CommandType => "SetCurrent";
+
+        /// <summary>
+        /// 目标电流值（μA）
+        /// </summary>
+        public float Current { get; set; }
+    }
+}