Mining: pool list can be imported, no more default list

The format is raw text, one record per line, with the format:
NAME: URI

NAME is free text (without colons), URI is the URI to the mining
port:

Example Monero pool: stratum+tcp://pool.example.com:1234

pages/Mining.qml

@@ -51,6 +51,30 @@ Rectangle {
         return uri
     }
 
+    function importPools(uri) {
+        var lines
+        var req = new XMLHttpRequest()
+        req.onreadystatechange = function(event) {
+            if (req.readyState == XMLHttpRequest.DONE && req.status == 200) {
+                lines = req.responseText.split("\n")
+
+                miningPoolModel.clear()
+                miningPoolModel.append({"column1": "Automatic (recommended)", "column2": "", "uri": ""})
+                for (var n = 0; n < lines.length; n++) {
+                    var line = lines[n].trim()
+                    if (line !== "") {
+                        var offset = line.search(":")
+                        var name = line.substr(0, offset).trim()
+                        var uri = line.substr(offset+1).trim()
+                        miningPoolModel.append({"column1": name, "column2": "", "uri": uri})
+                    }
+                }
+            }
+        }
+        req.open("GET", uri)
+        req.send()
+    }
+
     /* main layout */
     ColumnLayout {
         id: mainLayout
@@ -85,15 +109,10 @@ Rectangle {
 
         RowLayout {
             z: 1
+            Layout.fillWidth: true
             ListModel {
                 id: miningPoolModel
                 ListElement { column1: qsTr("Automatic (recommended)") ; column2: ""; uri: "" } // must be first
-                ListElement { column1: qsTr("moneroworld.com") ; column2: ""; uri: "stratum+tcp://drill.moneroworld.com:7777" }
-                ListElement { column1: qsTr("monerohash.com") ; column2: ""; uri: "stratum+tcp://monerohash.com:7777" }
-                ListElement { column1: qsTr("poolto.be") ; column2: ""; uri: "stratum+tcp://xmr.poolto.be:3000" }
-                ListElement { column1: qsTr("supportxmr.com") ; column2: ""; uri: "stratum+tcp://pool.supportxmr.com:5555" }
-                ListElement { column1: qsTr("xmrpool.eu") ; column2: ""; uri: "stratum+tcp://xmrpool.eu:5555" }
-                ListElement { column1: qsTr("prohash.net") ; column2: ""; uri: "stratum+tcp://xmr.prohash.net:2222" }
             }
 
             Label {
@@ -102,6 +121,22 @@ Rectangle {
                 text: qsTr("Mining pool") + translationManager.emptyString
             }
 
+            StandardButton {
+                visible: true
+                id: importPoolListButton
+                anchors.leftMargin: 17
+                anchors.rightMargin: 17
+                width: 110
+                text: qsTr("IMPORT POOLS") + translationManager.emptyString
+                shadowReleasedColor: "#FF4304"
+                shadowPressedColor: "#B32D00"
+                releasedColor: "#FF6C3C"
+                pressedColor: "#FF4304"
+                onClicked: {
+                    importPoolsDialog.open()
+                }
+            }
+
             StandardDropdown {
                 id: miningPoolDropdown
                 anchors.leftMargin: 17
@@ -113,6 +148,17 @@ Rectangle {
                 pressedColor: "#FF4304"
                 dataModel: miningPoolModel
             }
+
+            FileDialog {
+                id: importPoolsDialog
+                title: "Please choose a file to import pools from"
+                folder: "file://"
+                nameFilters: ["*"]
+
+                onAccepted: {
+                    importPools(importPoolsDialog.fileUrl)
+                }
+            }
         }
 
         RowLayout {
@@ -234,8 +280,11 @@ Rectangle {
 
     function start() {
         var address = appWindow.currentWallet.address
-        var flags = " -a cryptonight -u " + address + " -p x -o " + getSelectedPool() + " -t " + poolMinerThreadsLine.text;
-        appWindow.startPoolMiner(flags)
+        var pool = getSelectedPool()
+        if (pool !== "") {
+            var flags = " -a cryptonight -u " + address + " -p x -o " + pool + " -t " + poolMinerThreadsLine.text;
+            appWindow.startPoolMiner(flags)
+        }
     }
 
     function updateStatusText() {