implement factory reset option #368

Add a "Factory Reset" item to the Options menu, which calls
`DeleteAll()` on the config object, which actually deletes the config
file. After this the application is relaunched asynchronously without
parameters and the current instance is closed.
Signed-off-by: Rafael Kitover <rkitover@gmail.com>

src/wx/cmdevents.cpp

@@ -13,6 +13,7 @@
 #include <wx/sstream.h>
 #include <wx/url.h>
 #include <wx/wfstream.h>
+#include <wx/msgdlg.h>
 
 #ifndef NO_FFMPEG
 extern "C" {
@@ -2381,6 +2382,21 @@ EVT_HANDLER(Customize, "Customize UI...")
         update_opts();
 }
 
+EVT_HANDLER(FactoryReset, "Factory Reset...")
+{
+    wxMessageDialog dlg(NULL, wxString(wxT(
+"YOUR CONFIGURATION WILL BE DELETED!\n\n")) + wxString(wxT(
+"Are you sure?")),
+                        wxT("FACTORY RESET"), wxYES_NO | wxNO_DEFAULT | wxCENTRE);
+
+    if (dlg.ShowModal() == wxID_YES) {
+        wxGetApp().cfg->DeleteAll();
+
+        wxExecute(wxStandardPaths::Get().GetExecutablePath(), wxEXEC_ASYNC);
+        Close(true);
+    }
+}
+
 EVT_HANDLER(BugReport, "Report bugs...")
 {
     wxLaunchDefaultBrowser(wxT("https://github.com/visualboyadvance-m/visualboyadvance-m/issues"));

src/wx/xrc/MainMenu.xrc

@@ -466,6 +466,9 @@
         <object class="wxMenuItem" name="Customize">
           <label>_Key Shortcuts ...</label>
         </object>
+        <object class="wxMenuItem" name="FactoryReset">
+          <label>_Factory Reset...</label>
+        </object>
     </object>
     <object class="wxMenu">
       <label>_Tools</label>