Add drop down key selection support to Keyboard Manager UI (dev/build-features) (#2140)

* Added combobox

* Formatted and removed unused code

* Added drop down support for Edit Keyboard window

* Reordered the displayed key list

* Add shortcut stack panels and drop downs linked to detect shortcut

* Add more selected item logic

* Added complete dropdown support for edit shortcuts window

* Added Flyout warning for incorrect drop down input

* Tweaked warnings

* Removed MainWindow code

* Changed SelectedValue toSelectedIndex

* Removed unnecessary assignments

* Added a warning for two dropdowns and the first one is changed to an action key

* Added function comments in cpp file

* Fixed some comments

* Fixed all allocation and out of scope issues

* Fix most issues except reloading shortcuts

* Fixed issue while reloading shortcuts

* Fixed type cast warnings

* Changed delete to delete[]

* tweaked

src/modules/keyboardmanager/ui/KeyboardManagerUI.vcxproj

@@ -98,7 +98,7 @@
   <ItemGroup>
     <ClCompile Include="EditKeyboardWindow.cpp" />
     <ClCompile Include="EditShortcutsWindow.cpp" />
-    <ClCompile Include="MainWindow.cpp" />
+    <ClCompile Include="KeyDropDownControl.cpp" />
     <ClCompile Include="pch.cpp">
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Create</PrecompiledHeader>
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Create</PrecompiledHeader>
@@ -109,8 +109,8 @@
   <ItemGroup>
     <ClInclude Include="EditKeyboardWindow.h" />
     <ClInclude Include="EditShortcutsWindow.h" />
+    <ClInclude Include="KeyDropDownControl.h" />
     <ClInclude Include="pch.h" />
-    <ClInclude Include="MainWindow.h" />
     <ClInclude Include="ShortcutControl.h" />
     <ClInclude Include="SingleKeyRemapControl.h" />
   </ItemGroup>