feat(platform): move desktop windows to plugins/window and rework the tray

plugins/window replaces the window_manager fork on every desktop.

Changelog: Tray hotkeys, node delays and a delay test

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -19,7 +19,7 @@ import sqflite_darwin
 import tray
 import url_launcher_macos
 import wifi_ssid
-import window_manager
+import window
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   AppLinksMacosPlugin.register(with: registry.registrar(forPlugin: "AppLinksMacosPlugin"))
@@ -36,5 +36,5 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   TrayPlugin.register(with: registry.registrar(forPlugin: "TrayPlugin"))
   UrlLauncherPlugin.register(with: registry.registrar(forPlugin: "UrlLauncherPlugin"))
   WifiSsidPlugin.register(with: registry.registrar(forPlugin: "WifiSsidPlugin"))
-  WindowManagerPlugin.register(with: registry.registrar(forPlugin: "WindowManagerPlugin"))
+  WindowPlugin.register(with: registry.registrar(forPlugin: "WindowPlugin"))
 }

macos/Runner/AppDelegate.swift

@@ -1,6 +1,6 @@
 import Cocoa
 import FlutterMacOS
-import window_manager
+import window
 
 @main
 class AppDelegate: FlutterAppDelegate {
@@ -10,7 +10,7 @@ class AppDelegate: FlutterAppDelegate {
     }
     
     override func applicationShouldTerminate(_ sender: NSApplication) -> NSApplication.TerminateReply {
-        WindowManagerPlugin.instance?.handleShouldTerminate()
+        WindowPlugin.instance?.handleShouldTerminate()
         return .terminateCancel
     }
 
@@ -19,7 +19,7 @@ class AppDelegate: FlutterAppDelegate {
     }
     
     override func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
-        WindowManagerPlugin.instance?.handleReopen()
+        WindowPlugin.instance?.handleReopen()
         return false
     }
 }

macos/Runner/MainFlutterWindow.swift

@@ -1,6 +1,6 @@
 import Cocoa
 import FlutterMacOS
-import window_manager
+import window
 import LaunchAtLogin
 
 class MainFlutterWindow: NSWindow {