Use number keys for faster switch between the first 10 servers from main menu

ShadowsocksX-NG/AppDelegate.swift

@@ -595,6 +595,15 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDele
             item.title = profile.title()
             item.state = (mgr.activeProfileId == profile.uuid) ? .on : .off
             item.isEnabled = profile.isValid()
+            // Use number keys for faster switch between the first 10 servers from main menu
+            if i < 10 {
+                var key = i + 1
+                if key == 10 {
+                    key = 0
+                }
+                item.keyEquivalent = String(key)
+                item.keyEquivalentModifierMask = .init()
+            }
             item.action = #selector(AppDelegate.selectServer)
             
             menu.insertItem(item, at: beginIndex)