feat: 支持无标题、窗口圆角、系统菜单

窗口圆角、系统菜单兼容旧借口，新增无标题栏的适配

Log: 支持无标题、窗口圆角、系统菜单
Task: https://pms.uniontech.com/zentao/task-view-93008.html
Influence: 所有dtk应用的标题栏、窗口圆角
Change-Id: Ia847505216521c0206776b5159fe4ae5b41df1b8

Author: AlexOne

src/kernel/dplatformhandle.cpp

@@ -626,7 +626,10 @@ class Q_DECL_HIDDEN CreatorWindowEventFile : public QObject {
  */
 bool DPlatformHandle::setEnabledNoTitlebarForWindow(QWindow *window, bool enable)
 {
-    if (!isDXcbPlatform())
+    auto isDWaylandPlatform = [] {
+        return qApp->platformName() == "dwayland" || qApp->property("_d_isDwayland").toBool();
+    };
+    if (!(isDXcbPlatform() || isDWaylandPlatform()))
         return false;
 
     QFunctionPointer enable_no_titlear = nullptr;