Add a pairing utility for Wiimotes to Cemu (#941)

src/gui/PairingDialog.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <wx/button.h>
+#include <wx/dialog.h>
+#include <wx/gauge.h>
+#include <wx/stattext.h>
+
+class PairingDialog : public wxDialog
+{
+public:
+	PairingDialog(wxWindow* parent);
+	~PairingDialog();
+
+private:
+    enum class PairingState
+    {
+        Pairing,
+        Finished,
+        NoBluetoothAvailable,
+        BluetoothFailed,
+        PairingFailed,
+        BluetoothUnusable
+    };
+
+    void OnClose(wxCloseEvent& event);
+    void OnCancelButton(const wxCommandEvent& event);
+    void OnGaugeUpdate(wxCommandEvent& event);
+
+    void WorkerThread();
+    void UpdateCallback(PairingState state);
+
+    wxStaticText* m_text;
+    wxGauge* m_gauge;
+    wxButton* m_cancelButton;
+
+    std::thread m_thread;
+    bool m_threadShouldQuit = false;
+};