Update wxWidgets to 3.1.0

From wxWidgets master 81570ae070b35c9d52de47b1f14897f3ff1a66c7.

include/wx/defs.h -- __w64 warning disable patch by comex brought forward.

include/wx/msw/window.h -- added GetContentScaleFactor() which was not implemented on Windows but is necessary for wxBitmap scaling on Mac OS X so it needs to work to avoid #ifdef-ing the code.

src/gtk/window.cpp -- Modified DoSetClientSize() to direct call wxWindowGTK::DoSetSize() instead of using public wxWindowBase::SetSize() which now prevents derived classes (like wxAuiToolbar) intercepting the call and breaking it. This matches Windows which does NOT need to call DoSetSize internally. End result is this fixes Dolphin's debug tools toolbars on Linux.

src/osx/window_osx.cpp -- Same fix as for GTK since it has the same issue.

src/msw/radiobox.cpp -- Hacked to fix display in HiDPI (was clipping off end of text).

Updated CMakeLists for Linux and Mac OS X. Small code changes to Dolphin to fix debug error boxes, deprecation warnings, and retain previous UI behavior on Windows.

Externals/wxWidgets3/include/wx/init.h

@@ -21,7 +21,7 @@
 // do common initialization, return true if ok (in this case wxEntryCleanup
 // must be called later), otherwise the program can't use wxWidgets at all
 //
-// this function also creates wxTheApp as a side effect, if IMPLEMENT_APP
+// this function also creates wxTheApp as a side effect, if wxIMPLEMENT_APP
 // hadn't been used a dummy default application object is created
 //
 // note that the parameters may be modified, this is why we pass them by
@@ -67,9 +67,9 @@ extern int WXDLLIMPEXP_BASE wxEntry(int& argc, char **argv);
 // initialize the library (may be called as many times as needed, but each
 // call to wxInitialize() must be matched by wxUninitialize())
 extern bool WXDLLIMPEXP_BASE wxInitialize();
-extern bool WXDLLIMPEXP_BASE wxInitialize(int argc, wxChar **argv);
+extern bool WXDLLIMPEXP_BASE wxInitialize(int& argc, wxChar **argv);
 #if wxUSE_UNICODE
-extern bool WXDLLIMPEXP_BASE wxInitialize(int argc, char **argv);
+extern bool WXDLLIMPEXP_BASE wxInitialize(int& argc, char **argv);
 #endif
 
 // clean up -- the library can't be used any more after the last call to
@@ -87,13 +87,13 @@ public:
         m_ok = wxInitialize();
     }
 
-    wxInitializer(int argc, wxChar **argv)
+    wxInitializer(int& argc, wxChar **argv)
     {
         m_ok = wxInitialize(argc, argv);
     }
 
 #if wxUSE_UNICODE
-    wxInitializer(int argc, char **argv)
+    wxInitializer(int& argc, char **argv)
     {
         m_ok = wxInitialize(argc, argv);
     }