Added custom app support.

CustomAppsAddForm.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace MeshCentralRouter
+{
+    public partial class CustomAppsAddForm : Form
+    {
+        public string appName
+        {
+            get { return nameTextBox.Text; }
+            set { nameTextBox.Text = value; updateInfo(); }
+        }
+        public string appProtocol
+        {
+            get { return protocolTextBox.Text; }
+            set { protocolTextBox.Text = value; updateInfo(); }
+        }
+        public string appCommand
+        {
+            get { return commandTextBox.Text; }
+            set { commandTextBox.Text = value; updateInfo(); }
+        }
+
+        public CustomAppsAddForm()
+        {
+            InitializeComponent();
+        }
+
+        public void updateInfo()
+        {
+            okButton.Enabled = (nameTextBox.Text.Length > 0) && (protocolTextBox.Text.Length > 0) && (commandTextBox.Text.Length > 0) && (nameTextBox.Text.IndexOf(' ') == -1) && (protocolTextBox.Text.IndexOf(' ') == -1);
+        }
+
+        private void CustomAppsAddForm_Load(object sender, EventArgs e)
+        {
+            updateInfo();
+            nameTextBox.Focus();
+        }
+
+        private void nameTextBox_TextChanged(object sender, EventArgs e)
+        {
+            updateInfo();
+        }
+
+        private void okButton_Click(object sender, EventArgs e)
+        {
+            DialogResult = DialogResult.OK;
+        }
+
+        private void cancelButton_Click(object sender, EventArgs e)
+        {
+            DialogResult = DialogResult.Cancel;
+        }
+
+        private void selectFileButton_Click(object sender, EventArgs e)
+        {
+            if (openFileDialog.ShowDialog(this) == DialogResult.OK)
+            {
+                commandTextBox.Text = openFileDialog.FileName;
+            }
+        }
+    }
+}