refactor: modernize Cast discovery and app activation

Sources/App/TerebiApp.swift

@@ -3173,7 +3173,7 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
 
     func applicationDidFinishLaunching(_ notification: Notification) {
         NSApp.setActivationPolicy(.regular)
-        NSApp.activate(ignoringOtherApps: true)
+        NSApp.activate()
         NSAppleEventManager.shared().setEventHandler(self, andSelector: #selector(openDocuments(_:withReplyEvent:)),
             forEventClass: AEEventClass(kCoreEventClass), andEventID: AEEventID(kAEOpenDocuments))
         let arguments = Array(CommandLine.arguments.dropFirst())
@@ -3229,7 +3229,7 @@ public func terebiAppMain() {
     } catch {
         FileHandle.standardError.write(Data("terebi: \(error.localizedDescription)\n".utf8))
         NSApplication.shared.setActivationPolicy(.regular)
-        NSApp.activate(ignoringOtherApps: true)
+        NSApp.activate()
         let alert = NSAlert()
         alert.alertStyle = .critical
         alert.messageText = "Could not load Terebi configuration"
@@ -3254,7 +3254,7 @@ public func terebiAppMain() {
             PlayerModel.shared.shutdown()
             FileHandle.standardError.write(Data("terebi: \(error)\n".utf8))
             NSApp.setActivationPolicy(.regular)
-            NSApp.activate(ignoringOtherApps: true)
+            NSApp.activate()
             let alert = NSAlert()
             alert.alertStyle = .critical
             alert.messageText = "Could not initialize playback progress reporting"