add asset by url menu, ui and save logic

V2rayNG/app/src/main/kotlin/com/v2ray/ang/dto/AssetUrlItem.kt

@@ -0,0 +1,8 @@
+package com.v2ray.ang.dto
+
+data class AssetUrlItem(
+    var remarks: String = "",
+    var url: String = "",
+    val addedTime: Long = System.currentTimeMillis(),
+    var lastUpdated: Long = -1
+)

V2rayNG/app/src/main/kotlin/com/v2ray/ang/dto/SubscriptionItem.kt

@@ -8,4 +8,5 @@ data class SubscriptionItem(
     var lastUpdated: Long = -1,
     var autoUpdate: Boolean = false,
     val updateInterval: Int? = null,
-)
+)
+