Display Unicode character for keys in HotkeySettingsControl (#2249)

* Fix HotkeyControl virtual key display

* A new interop project was setup to provide wrappers for C# projects
  that want to access functionality in the common project.

* Add assembly info

* Remove WIN32 configurations

src/common/keyboard_layout_impl.h

@@ -0,0 +1,52 @@
+#pragma once
+#include "keyboard_layout.h"
+#include "..\modules\interface\lowlevel_keyboard_event_data.h"
+#include <string>
+#include <map>
+#include <mutex>
+#include <winrt/Windows.UI.Core.h>
+
+using namespace winrt;
+
+// Wrapper class to handle keyboard layout
+class LayoutMap::LayoutMapImpl
+{
+private:
+    // Stores mappings for all the virtual key codes to the name of the key
+    std::mutex keyboardLayoutMap_mutex;
+
+    // Stores the previous layout
+    HKL previousLayout = 0;
+
+    // Stores the keys which have a unicode representation
+    std::map<DWORD, std::wstring> unicodeKeys;
+
+    // Stores the keys which do not have a name
+    std::map<DWORD, std::wstring> unknownKeys;
+
+    // Stores true if the fixed ordering key code list has already been set
+    bool isKeyCodeListGenerated = false;
+
+    // Stores a fixed order key code list for the drop down menus. It is kept fixed to change in ordering due to languages
+    std::vector<DWORD> keyCodeList;
+
+public:
+    std::map<DWORD, std::wstring> keyboardLayoutMap;
+
+    // Update Keyboard layout according to input locale identifier
+    void UpdateLayout();
+
+    LayoutMapImpl()
+    {
+        UpdateLayout();
+    }
+
+    // Function to return the unicode string name of the key
+    std::wstring GetKeyName(DWORD key);
+
+    // Function to return the list of key codes in the order for the drop down. It creates it if it doesn't exist
+    std::vector<DWORD> GetKeyCodeList(const bool isShortcut);
+
+    // Function to return the list of key name in the order for the drop down based on the key codes
+    std::vector<std::wstring> GetKeyNameList(const bool isShortcut);
+};