Add Lts/Application module with Qt6 CMakeLists updates

- Copy Lts/Application from qt5-before (AarApp, OpApp, THP submodules)
- Update all CMakeLists.txt to use Qt6::Core, Qt6::Widgets, Qt6::Xml, Qt6::Network, Qt6::PrintSupport, Qt6::Svg, Qt6::WebEngineCore, Qt6::WebEngineWidgets
- No SIGNAL/SLOT, QRegExp, QDesktopWidget, or QTextCodec issues found in Application source code
- Module ready for Qt6 build validation

qt6-after/qt6-migrated-legatus/Lts/Application/THP/SitMapReplayTest/srp_main_window.ui

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SrpMainWindow</class>
+ <widget class="QMainWindow" name="SrpMainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget"/>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>29</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuFile">
+    <property name="title">
+     <string>Fi&amp;le</string>
+    </property>
+    <addaction name="actionStart_Replay"/>
+    <addaction name="actionStop_Replay"/>
+   </widget>
+   <addaction name="menuFile"/>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+  <action name="actionStart_Replay">
+   <property name="text">
+    <string>Start Replay</string>
+   </property>
+  </action>
+  <action name="actionStop_Replay">
+   <property name="text">
+    <string>Stop Replay</string>
+   </property>
+  </action>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>