[windows-x] Refactor runtime again

v2/pkg/runtime/runtime.go

@@ -0,0 +1,15 @@
+// +build !experimental
+
+package runtime
+
+import (
+	"context"
+	"github.com/wailsapp/wails/v2/internal/servicebus"
+)
+
+// Quit the application
+func Quit(ctx context.Context) {
+	bus := servicebus.ExtractBus(ctx)
+	// Start shutdown of Wails
+	bus.Publish("quit", "runtime.Quit()")
+}